No, I don't think that's it! That's a "Rectangular Micro QR Code".

I think it's this: https://www.qrcode.com/en/codes/microqr.html

Rectangular Micro QR Codes are not ordinary Micro QR Codes.

this makes me wonder if there is an `infinite` version of QR Code that can be streamed from a printer (well, I guess things can be chunked).