seems to be a device thing inherited from upstream (Lineage)
- https://old.reddit.com/r/LineageOS/comments/rudiht/what_are_these_apps_vayu/hqzv5nx/
- https://review.lineageos.org/c/LineageOS/android_device_xiaomi_sm8250-common/+/313099
- Google Assistant listed in /e/ System Apps - #27 by chrisrg
the way this works: check lineage.dependencies in the device repo which common repos it goes back to. If the common repos do import OEM apks in propietary-files.txt you’ll get them too. Appid of that assistant is com.android.hotwordenrollment.okgoogle.