Certainly not unattended, but no AI should ever be unattended.
But if you closely guide it, support it with tools like Ghidra and force force force force force a process with many sanity checks and quintuple-checks, it's possible.
What previously needed a whole team and months might be one guy, a lot of tokens and 1-3 weeks. Doable, fun, and interesting.
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Judging by the downvotes, I guess people mistook the initial comment for HN VC fueled AI delusions and I can't blame them for that. That's not what it was tho.