It's low effort, talking point nonsense. The whole reason this is interesting is that it allows the recovery of non-public information that was never released at all - about the closest analogy I can come up with is if it was somehow possible to reverse engineer part of an author's notes from their published work, though that's a very imperfect analogy. In order to tie this in to a pre-existing talking point about LLMs being bad, the current top comment has to basically completely ignore all of the reasons why this is interesting and surprising and considered an attack in infosec terms - indeed, not really engage with what it's doing at all.