On Timer Issues, Part 2

FlamingVictini - Last Monday at 12:22 PM
https://www.youtube.com/watch?v=JleDnoKCQ5Y
Smogon Premier League 9-Week 6: Blackoblivion vs FlamingVictini (Ultra Sun&Moon OU) w/Dokkerich
start at 9:50(edited)
once it says BO has 30 seconds left
start a real-life timer
10 seconds will elapse and it will say 20 seconds left
then another 10 seconds will elapse
before it says 15 seconds left
https://replay.pokemonshowdown.com/smogtours-gen7ou-352081
the replay shows the EXACT SAME timer messages
there are multiple examples of this throughout the game, that's just the first one i noticed