The site does not use FIDE's implementation of mste possible by any series of legal moves
The rule is more similar to the USCF implementation instead.
https://support.chess.com/en/articles/8557986-my-opponent-ran-out-of-time-why-was-it-a-draw
Erm actually i had a theoretical mate so i should have won
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Jiazhouli vs. Unmauero | Analysis - Chess.com