Absence of publication and peer review doesn’t imply anything. That’s only common in academia and a lot of theoretical and applied research happens outside of academia. And frankly peer review has a mixed track record even within academia, though the hard sciences are better than most.
This guy is probably delusional, and reproduction in controlled environments will be essential, but more unusual things have happened. I once worked on a program based on a theory breakthrough that came from a high school dropout with a colorful life history in a very rough part of town — obviously bright but unable to engage with any of the norms of academia.