As I understand it at the moment, you have to have the latest Validation tool installed to be able to use the Windows Update site.
But the Notification tool does not have to be installed to get updates.
I would imagine that sooner or later, the Notification tool will also have to be installed to get updates.
It has to be admitted that Microsoft saying the Notification tool cannot be uninstalled is a bit like a red rag to a bull ??
[Just to clarify my position, no flags, balloons or anything came up when I installed the Notification tool, ie legit ]