[ommz]

Xiaomi phones and their apps especially the freaking weather app are routine offenders on my firewall. I use NoRoot Firewall (beta version), that runs a local VPN, to whitelist connections and man, it's horrifying. I've enabled the "Always on VPN" and "Block connections without VPN" settings (Android 10) so NOTHING goes out unless through the firewall

[nasduia]

You should be able to disble those apps for your user with adb without root:

  adb shell pm uninstall -k --user 0 com.[miui,android,xiaomi].<appname>

Have you investigated if xiaomi.eu firmwares successfully curtail those connections?