There is a lot one can criticize* about what he claims, however, he is missing something obvious that stands out like a sore thumb even when taking on his descriptions at face value: Silicon!
Neil, super smug** and on every semi-intellectual speaking platform like TAM, on every show he can get his hands on and has a receptive target audience, from “The Daily Show” to “The Big Bang Theory”. But science is not finished and moves fast. Is it time for some quiet reading time and reflection once in the hyper schedule of politics and speaking engagements?
He argues that the most abundant elements in the universe are, in order of abundance, hydrogen (H), helium (He), oxygen(O), carbon (C), nitrogen (N), and “others”. “Others” is the usual trick: If data stop supporting your point, stop mentioning them. He also left out Neon (Ne) and Iron (Fe) before nitrogen (see Abundance of elements in Universe) in case he meant mass abundance; but let’s not be picky and insist on well defined metrics, because the biggest one relegated to “others” is: Silicon!
Now he goes literally “look at earth” in order to not mention the Abundance of elements in Earth, which would destroy his argument. Instead, he talks about human bodies: Oh look, it is H, Helium does not matter, O, C, N, and “others” (that "others"-trick again), precisely like the universe, he claims, so it is not surprising that we are here or whatever the gist is which he aims to push.
I am neither out to dwell on factual mistakes, nor much on the general mistake of supporting new-atheist pseudoscience that usually back-fires to ultimately support the religious, here for example having humans consist of the most common stuff in the universe, not in earth's crust or the ocean, where animals evolved. This is not my main objection, although I am puzzled: Why would an atheist effectively claim we are created in his image (him being the substitute god Mystic Universe), or worse, that the universe is made for us?
The interesting oversight is that he talks about aliens that are as advanced relative to us as we are relative to chimps*, and that they must be out there (he would have to claim that they have the same chemical composition as we), and that they would like to communicate with us just as much as we want to discuss philosophy with worms, namely: not at all. There is again much wrong, but let us focus on the big one. If you look at element abundances, for example that of earth's crust, but especially if you stay with his edited version of the universe's element abundance, and ask yourself: What is the next one, the next level up, like nitrogen for amino acids being important after carbon perhaps being sufficient for the pre-biological organic molecule soup? What comes next that would fit right in with Darwinist evolution of replicators/life forms that score “higher” on some sort of metric, and that will thus leave us in the dust like dinosaurs, but that also crucially need the next most abundant material around? Remember, the next abundant element is: Silicon!
Silicon is what our information technology is based on, so if his just-so-description tells us anything, it is that the universe is made for the computers and bio/hybrid-robots that may treat humans like we treat chimps in animal testing laboratories and zoos. The robopocalypse! Not aliens that are safely hundreds of light years away, but the very tools that we build.
He not see this connection, partially because he cannot mention the dangers of emergent technology in order not to undermine his main platform, being misguided scientism and uncritical embracing of technology.
* Beside mystic quotes like “the Universe itself exists within us” that promote scientism as substitute religion, there are many errors, like the misrepresentation of the richness of carbon chemistry, misrepresenting how far we looked out into the universe (superman “looks out” with a laser beam view; astrophysics merely receives the photons on the past light-cone), distorting genetics (taking a convenient measure to support a progressive agenda, one day presenting chimps as 98% genetically identical to us, the next having even identical twins only 80% genetically equal in order to doubt twin studies’ questioning the “all is nurture and culture” paradigm, effectively ending up with the position that black people are much more different from whites than chimps are - Oh Boy!), elitist misconceptions on what intelligence is about, ...
**UPDATE: Neil deGrasse Tyson has personally replied below and complained that my blog is more smug than him. Smug: Exhibiting or feeling great or offensive satisfaction with oneself or with one's situation; self-righteously complacent. I reject that, but of course I would, and of course he would. If one can avoid to come across that way, one should, and I avoid self-righteous satisfaction and complacency about my arguments. Those who claim to be all for science outreach and public understanding and are already in the lime light especially should not be complacent with backfiring arguments, regardless of how much target audiences and false friends enjoy and encourage it.