It’s some kind of pre-existing Z code relating to vaccination with a 3 and a 1 or 0 added at the end to make it specific to the gene therapy injections.
There was a thread about this a couple of weeks ago. Someone had already changed their tag line to the offending code and there was talk about making T-shirts up.
Like labeling Trump supporters deplorables—wear it like a badge of honor.
Creepy that they are tracking it digitally now though.
I missed that thread, but I would be interested in reading it. Not sure what I should search for.