Inspiron 5584 - Dell Update Notification "The system has been updated"

I believe have the same issue described in markwny153's unsolved 12-06-2018 thread Notification from Dell Update: The system has been updated in the XPS board. These Dell Update notifications stating "The system has been updated" started around 17-Dec-2019 on my Inspiron 5584 / Win 10 Pro v1903 (now v1909) laptop and appear about 5 minutes after every system restart. The problem occurs with the latest Dell Update Application for W32 v3.1.0 (Package 0TFPF, available <here>) as well as the latest Dell Update Application for UWP v3.1.0 (Package 9FX1M, available <here>).

If Dell Update Application for UWP v3.1.0 is installed I can stop these notifications by going to Settings | System | Notifications & Actions | Get Notifications From These Senders and turning OFF all notifications for Dell Update. If Dell Update Application for W32 v3.1.0 is installed these notifications cannot be disabled.

After reading today's suggestion <here> from DELL-Cares Moderator Prajesh I uninstalled and wiped any traces of Dell Update I could find on my system before installing the latest Dell Update Application for UWP v3.1.0. It didn't fix the problem, but here are the steps I followed:

1. Uninstalled the Dell Update Application for W32 v3.1.0_A00 (Package 0TFPF, Dell-Update-Application_0TFPF_WIN_3.1.0_A00.EXE, installed 08-Feb-2020) using Revo Uninstaller Portable Free v2.1.1 in Aggressive mode. Revo found 1 stray registry value not removed by the standard uninstaller (see image below) and 5 miscellaneous .lnk shortcuts in C:\Users\<myusername>\AppData\Roaming\Microsoft\Windows\Recent Items.
2. Re-booted and used CCleaner Portable v5.63 to clean all Windows and browser temp files and then ran CCleaner's registry cleaner. CCleaner found one registry entry related to a previous UWP version of Dell Update (Problem: Application Path; Data:  C:\Program Files\WindowsApps\DellInc.DellUpdate_3.1.54.0_x64__htrsf667h5kn2\Main\DellUpdate.exe; Registry Key: HKCU\Software\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Compatibility Assistant\Store) which I removed. Please note that I had previously uninstalled Dell Update Application for UWP v3.1.0 from the Control Panel on 21-Jan-2020 (I believe my Inspiron laptop originally shipped with an older version of the Dell Update Application for UWP) so I'm not sure why that registry entry references v3.1.54.0.
3. Re-booted and installed the latest Dell Update Application for UWP v3.1.0 (Package 9FX1M, Dell-Update-Application_9FX1M_WIN_3.1.0_A00.EXE  downloaded <here>). Launched Dell Update app and checked for updates - it reported no updates are currently available.
4. .Re-booted multiple times and confirmed no Dell Update notification stating "The system has been updated" appeared within 10 min of each system re-start (which is not surprising since I confirmed that Settings | System | Notifications & Actions | Get Notifications From These Senders was turned OFF for Dell Update by default after the clean reinstall).
5. Turned notifications for Dell Update back ON in Settings | System | Notifications & Actions | Get Notifications From These Senders. A new notification appears again after every re-boot as long as I click OK to clear the notification (see images below) before re-booting.

The only difference I notice now is that the notification banner for the UWP version of Dell Update v3.1.0 doesn't pop-up automatically in the system tray as it did for the Dell Update Application for W32 v3.1.0 (see the image I posted <here> for the W32 version). With the latest UWP v3.1.0, the notification icon in my system tray simply shows that one new notification has been posted and I have to open the notification action centre (see images below) to see it's from Dell Update.