Both players had already qualified for the next round. It’s also a rapid tournament. The stakes weren’t high which allowed them to goof around a bit. It was probably good publicity for chess & both players.

I was a bit disappointed by the game - it would be interesting to see a reasonable lets-try-to-win game from good players for a double bongcloud (since that, unlike an unilateral bongcloud, should be roughly equal and playable seriously), but it was just an agreed draw after the second move.