It's interesting that nearly all of these pieces of advice are fairly non-controversial. What's the point of posting stuff anonymously if it's the same stuff that most people would be happy to attach their name to?
As for why that's the case... well most people/sites don't want to become a social pariah, most underrated creators are by definition unpopular enough most haven't heard of them and truly unpopular opinions are unpopular enough that they're unlikely to get posted.
Still, when I heard 'career advice you wouldn't want your name associated with', I was thinking it'd be something like the stuff in that James Damore memo or what not. Or something inspired by Machiavelli's The Prince.