The com.apple.MobileAsset.MobileAccessoryUpdate.A2096.EA
MobileAsset type contains firmware updates for AirPods Max.
It's published in mesu for iOS (manifest) and macOS (manifest).
The manifest was first published by 14 December 2020 , around when the first firmware update was released.
For the release history of AirPods Max firmware updates, see the OTA Updates/AirPods Max page.