A dozen years ago a company hired me to maintain an ecommerce system that had been built for them by a guy that left soon after. They told me "he is not even a developer." That was my assessment too. The system mostly worked but it didn't run fast enough to process their daily load. It was a mess but it would cost too much to rewrite. I managed to fix the worst parts, then switched to other customers. No idea if they found somebody else to keep fixing stuff.
They kind of vibe coded that app well before vibe coding had been a thing.