The com.apple.MobileAsset.MobileAccessoryUpdate.A2084.EA
MobileAsset type contains firmware updates for AirPods Pro (1st generation).
It's published in mesu for iOS (manifest) and macOS (manifest).
The manifest was first published by 29 October 2019 , around when the first firmware update was released.
For the release history of AirPods Pro (1st generation) firmware updates, see the OTA Updates/AirPods Pro (1st generation) page.