This isn't true. All iPhone 12s are Qi compatible up to 7.5W.The new Apple Mag Safe charger on iPhone 12 devices is NOT compatible with the former Qi wireless charging specification. They must be plugged in, or install a MagSafe compatible charger device. I have not seen a Tesla specific MagSafe charger accessory offered by anyone as yet.
iPhone 12s, including the Pro Max, can work just fine on the Y's Qi charger if you solve the mechanical fit issue by either using no case or a slim case, or by inserting a spacer into the ledge that holds the phone.