AVG has apparently vacated the 1-year licenses which the activation code provided to AVG Internet Security and AVG Tuneup.
An AVG notification indicating a restart was needed appeared on my PC, something which occurred in the past for a program update.
Following the restart, AVG Internet Security and AVG Tuneup both indicated as Free functionally-limited versions with 366 day licenses.
It was nice while it lasted!
I was testing the AVG tuneup and they indeed removed the premium signature. The question is if this was really a "mistake" from AVG