AI can mean so many things. Like I’ve seen research couple of years ago where they used Machine Learning to let the computer control a player character to find holes in the level colliders or to find the fastest route. Like the AI found glitches to skip parts of the level. Basically the end goal of the research was to train an AI with Machine Learning so it could play the game 24/7 for days with thousands of agents that would take an QA team hundreds of people for weeks. There is a reason why bugs are often found at release, because a million players will of course find bugs quicker than a thousand QA testers. Ai could maybe replicate a million players, sure not perfectly but it will probably find bugs that the QA team missed.