I've experienced something similar as well, although I think the 'mentor' was sincere they were also incredibly neurotic and a bit paranoid from my point of vie

I've experienced something similar as well, although I think the 'mentor' was sincere they were also incredibly neurotic and a bit paranoid from my point of view. The few people that bought into their advice remained under their wing/control for over ten years and probably experienced less career development as a result.