> I also wonder whether the roof rule was written preemptively or retrospectively -- I hope the former.
Presume you're referring to [1], not the page you linked, and one might be inclined to accuse you of __feigning surprise__ but if not: using the roof is a quite common expectation in mid-rise buildings in big cities like NY, though not usually in a building you don't yourself own/lease in.
Why would you think they are talking about an entirely different page and topic?
OP referenced the roof rule by name in the OP, which was quoted in the comment that you are replying to. What do you mean "an entirely different topic"?