Scanning these codes with my phone revealed lines of text. No different than pressing a button to read a sign. Though, if you’re really hung up on it, the whole game can be played and beaten with only two mandatory-ish scans near the end.
Here’s some help for those who might need it.
I've collected the pieces. I'm ready to see the king.
The King only grants an audience to those who blindly give their trust to him.
I don't understand..?
Stand outside the castle, hold your eyes shut, and walk to the right.
That doesn't work...
The crown isn’t ready yet. You’ll need to forge it proper before you can deliver it.
I still don't understand?
With the crown pieces in hand, locate the screen with a giant forge. It might take some blind or quick platforming to reach.