[dang]

johnsonjo's post was fine. It's perfectly ok for users to remind each other of the HN guidelines, as long as they do so respectfully.

The parent comment didn't make any insinuations about astroturfing etc., so it didn't break the guideline you quoted. The phrase "if you're worried about abuse" is scoped to that form of abuse—we don't want users accusing each other of being shills and whatnot, but if people are worried that actual astroturfing or shillage is going on, they're welcome to email and we'll be happy to take a look.

I hope that is clear!