I vaguely remember that the 737 starts trimming a fair amount of nose up during an autoland.
I also remember that, when disconnecting the AP during a G/A, you had to quite significantly push the nose down and also aggressively apply nose down trim in order to compensate for the pitch up couple from the wing mounted engines.
I doubt they were trying to do an autoland on a cat 1 airport in Russia in gusty and WS conditions.
If they did a dual channel approach, there would be no reason to disconnect the autopilot as you then have auto go around capability.
Finally, they went around way above the altitude where the auto pilot will input trim during auto land. That happens at 400 (or is it 350) ft.