I am interested in this as well. I don't have an Apple Card and normally get 1.5% cash back, figured it wouldn't really be worth it to open up another credit card for an additional 1.5% , but if its 6% I'm in.
Oof, yikes. I‘d heard that it was a mistake and I guess this confirms it. Kind of surprised they’re rolling yours back and adjusting it instead of honoring it.