Of course if nobody can get their hands on a particular work, as seems to be the case here, that makes things kind of hard. But I'd expect most works you need to cite in a fast-moving field such as CS to be available at least somewhere, even if it takes a bit of effort.
True, but in this case you should include both references.
It's kind of wild that LLMs and other models/sequences will be able to quickly suss out which papers have high levels of referential integrity.
The problem with this, as I see it IMO, is that there could be references that are cited due to their influence on the thought process/writing process of the work - thus citing them gives contextual zeitgeist - and this is something that AI would not be able to muster...
SO a LACK of referential integrity should show that it is written by a human as opposed to an AI.