Unfortunately, A.I was used. The dev's Twitter proudly boasts as much, though I hesitate to provide a screenshot because it's also accompanied by a bunch of ableist slurs. You can look it up on your own, if you wanna be sure.
KaptajnenNot even 24 hours after later, and out of nowhere, the universe send us a #PepsiMan #Recomp Or rather, a dev named "Kareem Olim" Who has single-handedly recompiled this gem and made it playable directly in your browser pepsiman.ol.mr No A.I was used here. #retrogaming #decomp #PS1 #decomp #gaming