I consider it adware because there is no way to get the notification to go away. No obvious way, anyhow, and rather than search around for the "correct" way of doing it, I uninstalled the update and hid it in WU.

(Actually I did a brief search, and didn't find anything.)

So at this point, maybe you're right and it's not adware. I'd consider it borderline at least, but fine. Whatever.

However I got a second notification some weeks later, from the same package which I had already uninstalled and hidden remember, after it apparently reinstalled itself because MS released an 'update' to this package. So despite uninstalling it and following all the steps required to clearly communicate that no, I do not want this fucking thing on my PC, MS decided they'd push the update to my system anyway.

At this point it's no longer borderline. It is harassing behavior from something that is very obviously adware.