On my system with 5 displays, HWINFO still always puts the update available pop-up on my little 1080x600 stats display, and after updating, it puts the 3 graphs I have enabled there too, despite unchecking "Validate Windows Positions". In Task Manager I changed "At logon of any user" to "On Workstation Unlock", and deleted the trigger "At system startup". I don't think both triggers were required anyway. I also added a 10-second startup delay. If this works I will report back here. Thanks for the tip!
Edit to add - Windows 10 v22H2 Build 19045.3803. Also, this system uses Display Fusion for wallpaper and taskbar on multiple displays. I wonder if Display Fusion has something to do with it.