the man leveraged the fact that his name was the same as Andrew Carnegie (having no relation) to launch a publishing empire. it was hacks from the beginning
The very first thing I did when coming to this thread was search for if someone had already mentioned "one book theory". My favorite episodes of IBCK are mostly the self-help trash.
I wanted to love it since despite being a self help reader I can definitely see a lot of the bad/dangerous advice given all over the place but I often found them really stretching to make stuff negative and being very smug about it which just made it the same issue as the source material. Especially annoying since in most cases there were really solidly valid negatives to go after in the books. It's very much a lets build a straw man then tear it down podcast.
https://bsky.app/profile/ifbookspod.bsky.social
It really is all the same book.