The DMA does not define such details, it is much more simple and agnostic. It identifies if a company creates a market within its own ecosystem, invites others to participate but doesn't offer a fair competitive field.

--> If iOS introduces non-standard changes to Bluetooth and Wi-Fi to compete against Android, this does not concern the DMA.

--> If iOS introduces non-standard changes to Bluetooth and Wi-Fi to create a product of ANOTHER market-segment (Headphones, Watches, Routers,...) they are required to provide interoperability for other brands than Apple as well.

The reason is simple: iOS has such a critical size that it is anti-competitive behavior for Apple to modify iOS in order to beat the competition on e.g. headphones.