Filmmakers have already been using it to produce the existing immersive video content, so that's kind of a silly question. But it works for VR180, too, if that's your cup o tea.
Moreover, it's not really a proprietary format and you can already play them officially on Quest.
You're right. I was thinking of spatial video on the Quest. Immersive video is different, but I guess my point is that it's not mystery meat either. The barrier is as you said the performance required to push the pixels, not the format per se.
I dunno, Blackmagic clearly collaborates with Apple, and probably would have made this camera regardless of Apple Vision Pro or not, but once the two marketing departments came together, they decide to launch it with Apple Vision Pro filming in mind.
That's not to say it cannot be used for other things. Blackmagic frequently market all their cameras for prosumer/professional film-making, but you can use the cameras for so much more than just recording films, although the marketing is geared towards film-markers. Doesn't make it misleading.
They're just echoing Black Magic's own pitch that it's "designed for" Apple's platform and format, and that's evidently true given the specs and features. I don't think of that as misleading.
My take is "designed for Immersive Video" in the sense that Apple's format has very high specifications, and most other HMDs do not demand 8k per eye or 90fps. This camera meets the minimum specification for the Immersive Video format, but that doesn't mean you wouldn't also be able to render the output to other formats.
Moreover, it's not really a proprietary format and you can already play them officially on Quest.