Brilliant!! Why?

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[Event "gideonho512 vs. TheBigMouth"] [Site "Chess.com"] [Date "2023-08-25"] [White "gideonho512"] [Black "TheBigMouth"] [Result "1-0"] [WhiteElo "584"] [BlackElo "544"] [TimeControl "600"] [Termination "gideonho512 won by resignation"] 1. Nf3 Nf6 2. d3 Nc6 3. e4 e5 4. Nc3 d5 5. d4 Bb4 6. a3 dxe4 7. dxe5 Qxd1+ 8. Kxd1 exf3 9. axb4 Ng4 10. Ne4 O-O 11. gxf3 Rd8+ 12. Bd2 Ngxe5 13. b5 Nb4 14. f4 Nf3 15. Kc1 Bf5 16. Bxb4 Bxe4 17. h4 Rd2 18. Bxd2 Rd8 19. Bc3 Nd4 20. Bxd4 Rxd4 21. c3 Rc4 22. Bxc4 1-0 Playing as white. I went to the game review after the match and move 20 says brilliant (Bxd4), why is that? Seem like just a trade?
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Sorry the text is a bit messed up