If you mean whether he’s putting his money where his mouth is, he is doing that by risking the future of the company that is his biggest asset on it. It may not be exactly 3 years. But is will very likely happen.
I don't see how he's risking the future of his company by saying words that end up being false, he does that all the time and lying/exaggerating is probably an essential part of being an effective fundraiser these days. In my eyes an enforceable large bet would be much stronger evidence indeed than words.
If I'm building a warehouse and I say "this warehouse is going to house the worlds supply of x", am I risking the future of the company if that fails and I pivot to housing y instead?