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I'm not impressed.

the whole technique hinges on qr scanners reading only middle point of the squares

The moment you encounter developer that thought "for redundancy let's sample the whole square" (which is a very natural thought) - it breaks

I kinda expected working the limits of error correction, honestly. Not this blunt circumvention "because it works on my machine"

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I think sampling "the whole square" might actually not be that good for decoding even standard QR codes as aliasing at the edges of each code module ("pixel" of the code) in a camera image would actually make the distincion between 1s and 0s more difficult.

Your argument still partially applies though, as introducing new unrelated colors at the module edges could also lead to aliasing effects when the code is too small for example.

The specification of qr codes says you should look only at the centres, iirc.

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