I don't think that's the rule? I think the rule is if you're using quotes and it's ambiguous as to whether the person the quotes are attributed to actually said it, then the person better have actually said it.
(For what it's worth: this little subthread is about 10x more interesting than the story and the rest of the thread it's attached to).
It is also the case that this was something Paul Graham was idiosyncratically peevish about; at one point, he attempted a unified definition of trolling that amounted to "forcing one to rebut something they hadn't said" --- which obviously isn't the definition of trolling.
Yep, 'idiosyncratic' is a good way to summarize it. At the end of the day, it's just another dumb thing to yell at people about - it doesn't improve discourse or 'stimulate intellectual curiosity'. As an inveterate rule-yeller myself, the fewer of these the better.
(For what it's worth: this little subthread is about 10x more interesting than the story and the rest of the thread it's attached to).