Sure, if I suspend disbelief and assume that no other search engines or navigation services were used that do similar tracking—but the GP was specifically calling out QR codes, and they use the website anyway.
You don't have to suspend disbelief to come up with such a scenario. When I go to the bar down the street from my apartment, order food and a drink, pay cash and then leave, it was not an interaction that was likely to become part of my advertising profile. Now it is.
It's not comparing websites accessed via QR against every other already tracked thing in society, it's comparing it with laminated pieces of paper.
It's not comparing websites accessed via QR against every other already tracked thing in society, it's comparing it with laminated pieces of paper.