He claims to have permission from every developer. And if he forgot someone (how do he forget, if there is a literal list of who contributed), then the person should please talk to him. Also he claims to have rewritten lot of the parts where he did not have permission or he just wanted to rewrite.

I assume he did all of that and the code is pure. But I highly dislike this move. This guy cares more about others making money of his project, than the Open Source community. In fact, he is hostile to Open Source now.