Like all tools it depends on how you use it and your prior knowledge. I've found AI to be extremely useful for providing example code customized to my situatio

Like all tools it depends on how you use it and your prior knowledge. I've found AI to be extremely useful for providing example code customized to my situation when using new libraries. But for debugging, as appears to be the case in this study, I don't see how an LLM is much more helpful than static analysis. It can't build, run or test the code, it can't experiment, it can't construct a meaningful simulation of the running code to do any of the above. Might be good for a first pass, but otherwise you're back to basics.