I'm just as puzzled as you. What the heck, did people forgot how to encode data?
Unless it's actually smart, in sense QR codes carry some limited amount of data, MP4 does compression introducing artifacts and losing some data, QR codes can recover from some (well from a lot) loss of data, repeat. So it's DB with natural low-passing of data. Conceptually cool, kinda how memory update process worked in TV Series "Travelers" for Historians.
Or you know, I'm hearing SQLite is kinda nice and does not need encoding/decoding to-from QR-videos.