It depends? LLMs are not a silver bullet for writing bug free software (IME at least, and of course it also depends on the "threshold" what actually counts as a bug). They're definitely good at not creating the trivial "mechanical" type of bugs a tired and overworked human programmer would create (but oth those are also the easiest to find with traditional debugging tools and testing).
They're definitely a useful additional tool for finding more (and more obscure) bugs, but that takes a lot of both human and compute effort too (quite a few of the reported bugs are actually false positives on close inspection, and apparently even with the latest locked down "wonder weapon" models like Mythos), and after all the reports are clean and validated you still can't be 100% sure (but at least a bit more confident) that the code is now free of bugs.