It does appear to be a record minimum, although just slightly below Kasparov-Anand 1995.
And since they drew in 22 moves today, TwoSheds has officially broken his old record.
It's interesting that, although this has been the most chessless match in history, that there were technically no "GM" draws in it. Every draw went past Move 20. It's just getting to Move 25 that was so difficult.