[2021] Matchmaker either not working today or just punishing players for the lols.

According to publicly available data - you've actually won close to half your battles in the last 114 recorded.
"5 or 6" wins might be a little bit of an exaggeration, don't you think?
Tier 7 is one of the most difficult tiers to play. People sort of say "T7's vs. T9's is much harder than T8's vs. T10's" and I agree. The armor thresholds for AP overmatch and the addition of module slot 5 makes T8 much more capable of going against T10's than it is for T7's to go against T9's.
For the record - I can assure you that the match-maker has nothing against YOU, personally