Surprised this artist has gone so long without tripping AI flags. Maybe im not keeping up and i am too slow but the way the text is written on all these posts, the outlines, and heavy use of character censoring which is a frequent thing when I see someone selling AI sets on pixiv or fanza.
The joke is that the word pronounced "taco" in Japanese translates to "octopus" in English. Additionally, telling someone "Kono Taco!" ("You are octopus") in Japanese carries a nuance of "You are stupid".
I've also seen people on Reddit use tacos as a joke about having tacos for dinner whenever that fat orange blob doesn't do as he claims he'll do.