I think you might be misreading his argument. Are you are interpreting it as "Startup founders become very rich only if companies don’t create real value in return for that wealth"? If so, I don't think that's what he intends.

I read it as "Technology only creates greater inequality if companies don't create real value". I'm not sure if that's actually true, but that interpretation seems less contentious and more in line with the rest of the piece.