You're right. They changed the definition. It's just a reasonable sacrifice.
Brilliant Moves are always the best or nearly best move in the position, but they 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 additional conditions:
You should not be in a bad position after a Brilliant move
You should not be completely winning even if you hadn't found the move.
We are also more generous in defining a piece sacrifice for newer players compared to those who are higher-rated.
I guess I'll take the brilliant lol