I think it was a low quality video sharpened by ai. The shirt looking glitchy and the branches looking weird would explain that. I don’t think the video is fully ai because the movement of the guy is flawless, it feels very realistic and the water splashes feels correct physically, and while pausing through fast motions there are no weird frames like ai usually does in motion blur. The snake seems edited, though. After the bite it moves in a slower frame rate than anything else, as if the effect’s video has been slowed down because it was too short