People get all excited over the "brilliant" label. Here on chess.com, it doesn't mean you played a brilliant move. It means you played a decent sacrifice. They should relabel it "Decent Sacrifice."
Brilliant (!!) moves and Great Moves are always the best or nearly best move in the position, but are also special in some way. We replaced the old Brilliant algorithm with a simpler definition: a Brilliant move is when you find a good piece sacrifice. There are some other conditions, like you should not be in a bad position after a Brilliant move and you should not be completely winning even if you had not found the move. Also, we are more generous in defining a piece sacrifice for newer players, compared with those who are higher rated.
I think it's stupid you need to go diamond to check you insights