Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
If you do a hard reset or even turn your iPhone off for s period of time you will not get a ScreenTime Notification
I rebooted a couple of times last week (was trying to debug an unrelated issue) and I got my first notification in weeks.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.