And this site, while unofficial, does seem to be leaning your way because it has KC still at 21. Although curiously, it does say "Tiebreakers will begin to be calculated when there are 32 games remaining in the MLB season.".
https://playoffmagic.com/mlb/league/
Then again, this one has it at 20:
https://www.playoffstatus.com/mlb/americanwinmagicnumbers.html
Soon MLB.com or ESPN will start adding elimination numbers to its standings and we will know for sure.