Bro this sprite was created like 3 years ago, way before AI was even a thing.i think this is missing the AI tag on it because the sister generic happy pose having the peace sign is a trademark ai move cause when it does hands it will put them into peace signs.. given the context of the model being used in scenes there is no need for a peace sign it stands out which screams ai generated. plus some of the models are cut off like the images were generated withing a specific border..
So no, it's not AI.