As far as the more general point that presidents still have to convince congress to pass the legislation they want, that's true far all candidates for president. I understand that. When they promise to do X, if X is something that would require an act of congress, I understand that to mean that they will try to get congress to do X and will sign it if they do it. My issue here is that he won't say specifically what he wants them to do.
He's a consensus organizer. He doesn't stand for any particular position.
He brings people together in an endless business meeting and has them
work through the issues until everyone agrees on what to do. Think less
of him as a black box question mark and more of him like a transparent
glass semicolon.