1. It doesn't matter whether "sophonts" (whatever exactly you mean by that) are voluntarists. It might matter whether voluntarism is right, which is an entirely different question, but I don't think it's credible that even that is relevant here. Why should anything so broad as voluntarism be necessary for anyone to be able to "definitely assert" that something is true? (Note that I didn't claim, e.g., that anyone at all can sincerely assert that anything at all is true.)
2. "The otaku theory of biology"? Are you just trolling?
3. "Voluntarist personality" doesn't make any sense. Voluntarism is a philosophical position, not a personality trait. If you mean that I'm the kind of person who believes whatever they feel like, well, please go ahead and believe that if you feel like doing so.
4. There is no theorem that would make us dead if human cognition weren't as good as scientists-at-their-most-careful, and if you think Conant and Ashby proved anything of the sort then I think you are badly deluded. What might be true (though actually I don't believe any theorem comes close to proving this either) is that if human cognition weren't perfect then we would be mortal. Guess what? It isn't, and we are.