Some time ago, I tried to use https://github.com/alisinabh/paperify to back up some data I had in the form of QR codes on paper. Turns out the standard printer is very limiting in terms of how many bits of data you can fit into paper if you want to read it reliably. I would guess this would be the same in their case. Maybe they will come up with a good protocol with error codes that would suit their "printer".

Anyway, I like the concept of storing QR codes on paper or other medium even if it is not really practical.