SeedQR is a clever way of transforming your seed phrases into a single stream of digits
Just to extend a bit your statement.
There are two formats of SeedQR:
Standard SeedQR and CompactSeedQR. The first one transforms seed phrases into decimal digits stream while the second into the stream of binaries.
Whatever is the flavor of SeedQR, the online relevant readers must never be used to decode them into SEEDs.
This is totally accurate and I am sorry for not bringing it up alongside my explanation for how a SeedQR works. Whatever the OP decides to do, he/she should ideally use a air gapped device to read whatever SeedQR code that he currently holds.