It’s not the magnetic alignment that makes it capable of 15W charging, it was an artificial limit because MagSafe IS Qi charging but the only difference is that it had magnets, also other Android phones are capable of 7.5W+ charging with Qi standard so…This is incorrect.
The phone could always do 15 W through MagSafe since the day it was released.
Outside of that, it could do 7.5 W for regular wireless chargers that didn’t have magnetic alignment.
Qi2 adds magnetic alignment to the QI standard, therefore now more third-party chargers can do 15 W charging.
QI2 products only started shipping last quarter.