The marketing blurb that's linked makes it quite clear that this targets retro hobbyists, who want a modern take on the C64. It's not really meant to be a practical design.
It still is a more practical design than a flat keyboard, which only masochists would use willingly.
It gives me somewhat more Amiga A500 and A500+ vibes... ;)
I see it as a spiritual successor to my much loved childhood Amiga A500 which partially spurred my life long love of computing.
The GPU pins on the back are nice, as is the fact that all IO is cleanly at the back of the device.
That being said, my only real desk is almost entirely consumed by workstation/gaming PC and it's associate monitors that ironically this more convenient form-factor is less convenient for my use cases.
I have a bunch of Pi4s at home they work well as I can power them over PoE, don't spit out too much heat, have a well supported stable OS and are great for running small personal projects and workloads. (Home assistant, DNS, a few other docker containers that power things internal to my network) - sure a NUC would be more powerful, but then I have to find a way to route power in to it, and I'm running out of wall sockets!!
I think this is a wrist geometry thing. A macbook dock that lifted the back, putting the keyboard on a slant, did serious damage to my wrists over the period of a year or so. That was the better part of a decade ago.
They've slowly partially healed since changing to a keyboard parallel to the desk surface. There are climbing moves I still cannot do because of it. Ymmv.