I don't see how that would be cheating. On the other hand, the help section on cheating is saying "For Live games on Chess.com, if you are looking at anything other than the game in front of you, you shouldn’t be!".
https://support.chess.com/article/317-what-counts-as-cheating-on-chess-com
He's gone under the thread...
Now I just need to find out WHO took my strawberries?
THERE WILL BE NO TALK OF WIRE COAT HANGERS IN THIS THREAD EVAH!

I don't see anything wrong with that......if he does it long enough, it will become memory.