Well, I'm going to be slightly contrary. First, I think what was said would be advice because it's suggesting how to play the hole.....hit a shorter shot that keeps the hazard out of play. This rule is not intent based, so even if the player was trying to be helpful with public information, he still gave advice.
But.....because the advice was given other than in a stipulated round, I'd feel more comfortable giving the player a penalty under R8-1 if I could find a similar decision to what transpired in the OP's question. The closest thing I could find would seem to indicate no penalty on the basis that neither player was currently playing in a stipulated round.
Player Who Has Not Yet Played Seeks Advice from Player Who Has Finished Round
Q.May a player about to start his round seek advice as to clubs used at various holes from a player who has just finished?
A.Yes. Rule 8-1 applies only during the play of a round.
Stipulated Round in Match Play
In all forms of match play other than threesomes and foursomes, a player has begun his stipulated round when he makes his first stroke in that round. In threesomes and foursomes match play, the side has begun its stipulated round when it makes its first stroke in that round.
The stipulated round has ended in match play when all of the players in the match have completed the final hole of the match (although a player may lodge a subsequent claim under Rule 2-5 or correct wrong information under Rule 9-2b(iii)). With the first round of a 36-hole match, the stipulated round has ended when all the players in the match have completed the final hole of that stipulated round.
Stipulated Round in Stroke Play
In all forms of stroke play other than foursomes, a competitor has begun his stipulated round when he makes his first stroke in that round. In foursomes stroke play, the side has begun its stipulated round when it makes its first stroke in that round.
In individual stroke play, the competitor's stipulated round has ended when he has completed play of the final hole of that round (including correction of an error under a Rule, e.g., Rule 15-3b or Rule 20-7c). In foursomes or four-ball stroke play, the stipulated round has ended when the side has completed play of the final hole of that round (including correction of an error under a Rule).