How can I get rid of the "Restart now to finish the update" popup?

I have a Pixel 2 XL that I MUST keep on Android 10 for various reasons. *(Yes, I am aware of the implications of doing this. This is a device that I use for development tasks, I don't go to random websites on it, I don't install unknown apps, I never use it away from my trusted home WiFi network, etc.)* However Google seems hellbent on making me upgrade. Every few days I get a popup message (shown below) asking me to "restart now to finish the update." **I get this popup even though I have "automatic system updates" turned OFF in Developer Settings, and even though I have Google Play Services notifications turned OFF.** Is there any way to stop this message from appearing?