Well, that was from 2012 so it is possible a bug was exploited. Also, premoves at one point didn't take any time so it very possible almost all the moves came under that condition and the client side didn't update the clock after each move.
bullet 1/0 time rule
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I watched bullet 1/0 chess videos, I noticed sometime remaining time was increased.
for example:
https://www.youtube.com/watch?v=jATffyCre8c
white's time was 0:49 before 52nd move, but time changed to 1:00.
How can time increment in bullet 1/0?