My memory of RDPD was that it preaches getting assets which generate income, not that your management of those assets would be passive. Though obviously it also did have a subtext of "scale some kind of assets that generate income to a certain point and you can pay someone else to do more of the grunt work while you look into a new opportunity."
By working and investing. More successfully at some points than others. But you’re totally right that different people are better set up and more or less inclined to move on from a job than others.
Yes, it was the exact same scheme. Rich Dad Poor Dad was basically "Buy lots of cheap, crappy houses and become a slum lord" expanded into thousands of pages of books, seminars, and self help guides.
There really should be a special category for business books written by people who’ve gone bankrupt. I know at least two well known examples, but there’s got to be a whole lot more.