Modern abliteration is quite good at not damaging the model on ordinary topics. But yes, on many of the weirdest "forbidden" topics (excluding the mild stuff like ordinary erotica) there's not going to be any real training of any sort and it's basically hallucinations running wild. You even see this claim repeated explicitly on every model release "safety card": 'no, this model does not have the sort of fiddly tacit know-how it would need to actually advise anyone nefarious on this dangerous stuff'.