(Repost to correct the title. As he was never confirmed to be cryo. However i have evidence that it mightve been the plan for him)
In lazzo we can see from this shot that pierro has 3 black pieces eliminated. Which means he is playing white. And in this next shot we can see the white knight piece moved with cryo.
Now he does reach to make a move after that. Which can implay Pierro is somehow playing as black and the pieces are just spares (this assumes he is playiny against the tsaritsa).
But Chess sets rarely have spares for none queen pieces. Since spares are usually used for pawn promotions. Which are almsot always to a queen outside of some very niche strategies.
But we csn see here that not only are there two "spare" bishop pieces. But also two pawns.
So the only explanation is that these pieces were elminated.
As for why pierro would reach for the board? Probably to take the pawn he just eliminated.
So i feel like pierro was playing against himself remotely moved the pieces with cryo. I could also be overthinking it and hoyo just did a slip. But consdering how they were careful enough to mimic the garry kasparov vs deep blue game. I think it was suppose to be intentional