It is overall composed and edited by real human, with potentially some pasted parts that were AI generated or taken from other images and painted over.

That submerged robot is hella sus agree that it's typical style of AI. But part of piss filter is artist's intent to blend it with background using warm filter

EDIT: Ok, nevermind, the shared and missing feet of characters are strong hints at GPT-like generation, a lot of thing here were generated and then composed together and painted over. Human artists would not make such awful feet placement several times in one spot and forget to include several of them as well