Source:
https://aw.my.games/en/news/general/update-0705-now-available
The progression variant of the T-80U is disabled from selection, upgrade, or play, but reskin premium versions such as Shark and Spacewalker are not. Nevertheless, playing matches in those versions of T-80U will not actually contribute to the 100-match unlock requirement for the T-80UM-1 Bars, at least not for this current build.
A few more confirmations from SS on official Discord server:
Only progression variant counts for the 100-match requirement
Requirement is not retroactive, i.e. you have to start from 0 after today's update and when the progression T-80U is enabled again in the future (ETA unknown)
There is no time limit for unlocking the T-80UM-1 Bars
There is a bug showing a currency icon with the text "overprogression_t-80u" on the queue window when waiting time exceeds 3 minutes (i.e. when the bonus kicks in). SS says it is a visual bug with "no real impact or anything".