Not really. A brilliant move is just a reasonable sacrifice, adjusted for your rating.
They changed the definition last year.
It doesn't mean the move was actually brilliant.
This comes from the Help pages:
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.
the best thing