To be fair, it doesn't seem to be mentioning this until the "Purpose-built on Compute Module 5" section which is more than halfway through the entire landing page, I was similarly lost until I got to that section and actually understood what I was looking at :)

Looks really fleshed out and fun though, now I just need to get my hands on a proper carrier board it seems, as the audio out of the box for standard CM5 development I/O board is kind of horrible.