However, sure, I'll humour you. A "signed and expiring token" is not sufficient because then a single attacker could use that token to try 1000s of cards before it expires.
Thus, you need a unique token, and wherever you store that unique token (to invalidate it, akin to a database session), you can optionally store the mouse movements or not. The association still exists. A unique token isn't functionally different from just sending the data along in the first place.
I would flag it as attempting to trigger others if each reply did not also contain one or two constructive sentences.
> with people who don't seem to have a good understanding of the law
"People" had a fine understanding of applicable PII law, but the person clarified (in between a bunch of bullshit about how godforsaken sorry they are) that they were talking about some USA thing specifically and not the broader definition.