Unless there's some parallels going on about the relationship with jinx and silco to Rei and Gendou, my guess is that it's just nonsense for the fun of it

Lmao, it's Ayanami Rei cosplaying as jinx from arcane going to see Ikari Gendou (from Evangelion) and he's just on his meme serious pose but he's also just taking a dump. It's just silly stuff 💀.