Interesting take, and I'd be willing to concede your statements have a great deal of merit. Certainly, measuring by successfully building an audience, the man is a genius.

However, where you say "He writes about evertyhing without caring what someone thinks," you're missing a crucial piece.

He apparently doesn't care if what he writes is accurate or not. As long as people read what he writes, he doesn't seem to worry much, if at all, if what he writes provides actual true value. As long as (most of) his readers accept it, he appears to be fine with it being made-up BS.

So, if I want to learn about becoming a successful online writer, I might read what Denning writes. If I want to learn about, say, personal finance, I'd steer clear. Way clear.