The FIDE rules state:
12.4 The scoresheet shall be used only for recording the moves, the times of the clocks, the offers of a draw, and matters relating to a claim and other relevant data.
I believe this rule has been used before, against Wesley So in the 2014 ACP Golden Classic tournament (more here). But, what about this?
This is Carlsen's scoresheet from his game with Alexnnder Donchenko in the 2018 European Club Cup, where he wrote "Absolutely no shorts allowed" instead of writing his and his opponent's names.
Isn't this a violation of the rules? Why didn't the arbiters take appropriate action?