As rob mentioned, there is no specific rule in either RRoP or TDA about table talk, let alone specific things like asking about action in prior streets. The closest they get is:
Quote:
The following actions are improper, and grounds for warning, suspending, or barring a violator:
[...]
Making statements or taking action that could unfairly influence the course of play, whether or not the offender is involved in the pot.
and
Quote:
62: No Disclosure
Players must protect other players in the tournament at all times. Therefore players, whether in the hand or not, must not:
Disclose contents of live or folded hands, Advise or criticize play at any time, Read a hand that hasn’t been tabled. One-player-to-a-hand is in effect. Among other things, this rule prohibits showing a hand to or discussing strategy with another player, advisor, or spectator.
In general, most floors here agree that dealers or floors are permitted to answer questions about the rules of the room, even if doing so might be considered to be something that "affects the action", as long as the question is being asked by the player whose turn it currently is. Dealers (and players) are permitted to answer questions about how the action proceeded on the current street, particularly if oversized chips or other context issues make it difficult to ascertain based just on chips across the line. But no one should be asking, or particularly answering, questions about action on previous streets.
The dealer keeping quiet is perhaps the smallest issue in what you described. Your response seems to have answered the question, and player apologized, so whatever. Mention it to a floor later if you want.