chess.com reveiw is a toxic fellow
A link is the only way I could add it (I am on mobile)
All you have to do is to get a mobile browser app. Then you can do everything on the website.

I can sort of see what you are talking about. The tablebase shows that you can win by promoting to a queen or a bishop. It is not a coach. The tablebase is a computer program that has worked out all the possible moves with only 6 or fewer pieces on the board. It shows the exact moves required. It also shows that if you promoted to a rook, you could only get a draw. (There is also one for 7 or fewer pieces. It is not available here as far as I know.)
The table base would show that a win with the queen is faster than the one where you promote to a bishop but promoting to a bishop still wins easily.
I can sort of see what you are talking about. The tablebase shows that you can win by promoting to a queen or a bishop. It is not a coach.
The OP explicitly said: "the Coach" told him that promoting to a bishop is best.
That's a very far cry from the tablebase listing them as both winning.