Very interesting.
The Shocker
The first move is indeed shocking and hard to find. Black has several winning moves after 34. Rgd2 though. That's the trouble with engine analysis. It always seems to suggest that one move is better than another but it ain't so. A -7 move win is as easy as a -8 move win, and sometimes a whole lot easier - for a human!
Black to move and win. White will play the best possible defense.