Hanged the knight... no blunder?

hi all, this is my first post to the forum. this game makes me wonder. I hope it gets posted correctly. The move '18. Nd2' was, from my perspective, a blunder. The intention was, to finally bring the knight into game and help defending against the queen. but it was uncovered, and free for the queen to capture. I was worried but my opponent didn't see it. puh. But wait, Stockfish finds, it was 'Brillant'. Thanks, but no. it wasn't. was it? I just don't see it. thanks for your opinions. [Event "thmshd vs MKB-Louisky"] [Site "Chess.com"] [Date "2023-07-03"] [White "thmshd"] [Black "MKB-Louisky"] [Result "1-0"] [WhiteElo "978"] [BlackElo "951"] [TimeControl "6000"] 1. e4 c6 2. Nf3 d5 3. exd5 cxd5 4. d4 Nf6 5. Bd3 Nc6 6. O-O Nxd4 7. Nxd4 Bg4 8. Be2 e5 9. Nb3 Bd6 10. Bxg4 e4 11. Bh3 Qc7 12. Nd4 Bxh2+ 13. Kh1 g5 14. Bxg5 Be5 15. Bxf6 Bxf6 16. c3 Qf4 17. Qa4+ Kf8 18. Nd2 e3 19. fxe3 Qe5 20. N2f3 Qxe3 21. Rae1 Qh6 22. Qd7 Rg8 23. Nf5 Qg6 24. Qd6+ Be7 25. Qxe7# 1-0

Oh maybe the link https://www.chess.com/live/game/82154562323