According to its logs, my bargain basement Huawei 4G router from 2019 got an update last week.

I hope that most of these devices actually do update themselves automatically, and people just aren't noticing. (Whether the updates are any good is another matter!)

My UDM-Pro had an update available yesterday. I don't know if it's related to the CVE or the shit eMudhra CA.

This is a good point, thanks. We know one does which beats none.