A lot of time has past since I read Scott Adams view on manifesting. I got a decent way through before I realised it wasn't satire. It did seem clear to me that he was advocating a form of manifesting that went beyond either of those principles. That benefits came from manifesting in ways that no-other influence from yourself would be possible. That's essentially declaring it to be magic. Psychology I can believe, if you want me to believe in magic you're going to need a bit more.
From the point of view of an ADHD person, it doesn't surprise me at all that someone who had the ability to do a dumb task like manifesting would also have the ability to do meaningful things that that I find nearly impossible.