I wonder what the exact language was. If it included something like “5 star review” on that card, then the guy deserves getting kicked out from Amazon and getting his business shut down (it’s federally illegal to do that per ftc regulation). If it was just very neutral language asking for reviews, then that sucks, and hope he can get it resolved with Amazon eventually.
* there was no obvious way to do it. Closest thing was by reporting issue on product.
* there was no way to show the customer service agent a picture of the mail. Chat did not support sending pictures & they were unable to open imgur link.
* agent recommended me to leave a report it by leaving review to the seller page. I did that and next day review was deleted.
So it's pretty clear that Amazon didn't care and I doubt it has changed (unless the law you are talking about is recent one).
I also went looking for a way to report it. Eventually opened up a chat, didn't really get anywhere.
(I also didn't appreciate getting junk mail for ordering something).