Apple doesn’t sell genuine Apple batteries to anyone but authorized service providers who can only use these to install them in phones themselves. The only genuine part you can get is a second hand battery from a broken phone. Who wants that?
I doubt they would be. Even laptop battery BMS systems brick themselves so they can't be reused. It's where I get all my 18650's from. They are all NOS batteries that were never used and the BMS disconnected the cells due to fractionally too low voltage. Cells are fine but the BMS chip will never work again.
Whatever, can't lose if you never play Apple's game.