I don't think they're any more skilled at it than someone who knows how to reverse engineer stuff... But it is definitely a place where AI is amazing because reverse engineering is usually extremely time consuming and tedious. AI doesn't care about that.
It also has the benefit that it doesn't usually matter too much if it gets minor details wrong. It's definitely one of the areas - like hacking - where it's a) tedious and b) insensitive to mistakes where AI absolutely shines.
My experience is that they're better than me at a lot of the process, so probably worse than someone who's a full time reverse engineer but as good as or better than most. They'll definitely get some small details wrong that would derail the entire thing, so having some skills that are pretty much "This smells wrong" helps a lot, but I think for many scenarios they'll unblock someone who has little RE experience.
Also verifiable. LLMs shine when they can know when the task is completed correctly. Otherwise they will finish and hand over something that's wrong.