For example, it could be that some company offered this kind of AI to the army, with those exact words, and they refused (which sounds incredibly reasonable). The interview would serve a purpose of deliberately mocking such offer, in public.
There is almost no downside to this, as you already mentioned "everybody and their brother predicts Military Involvement [with AI]", and I quote you to illustrate that the idea that this is engrained in the popular culture (maybe by design).
Companies such as Raytheon and other traditional military contractors have been researching AI (not necessarily chats) way before Sillicon Valley. They can (and probably do) offer consultancy to the army regarding which technologies are safe to employ for critical decision-making.
I'm not defending them, by the way, just exploring some ideas around what possibly is going on here. Letting my imagination go a little beyond what the typical scenarios imply.
What I know for sure, is that AI-2027 is not a serious prediction. It's a piece of fiction. Kind of in the vein of The Blair Witch, with some tones of realism to impress the public, and a little bit more sinister in the sense that it resists the idea of being interpreted as fiction (which I think it's a downer, they could have reached more acclaim by being artists than scammers).