I saw that bug in my last game. In my opinion the coach doesn't understand the move idea.
He says: "You move your bishop to a more active square so that his range increases" but this move is simply sacrifice the bishop in order to promote a pawn. So in general, I have noticed that the coach often says only pre-programmed phrases without referring almost at all to what happens during the game.
At lower review strengths it may not see the best continuation and give sub-optimal lines. A the strongest depth it says the move moves closer to mate.
I saw that bug in my last game. In my opinion the coach doesn't understand the move idea.
Link to the game: https://www.chess.com/analysis/game/live/113730626737?tab=review&move=0