When I was shopping for a new car, Hyundai had an offer for a free Lvl 2 home charger (though not installation) with the new car purchase on the Ioniq 6.
To be fair, a Level 2 charger probably costs them less than $200, it's not a crazy thing to throw in with a $50 000 car.
Your argument is correct, but you're overestimating the actual price of the car by 10%+, and underestimating cost of a level 2 charger by about the same amount (or rather, a level 2 plug or adapter. Unlike DC-DC charging, the AC-DC charger is installed in the car itself: the on-wall device just handles handshake and various safety shut off mechanisms).