Exactly, a single yellow and double yellow have completely different restart rules.
Had this been a single yellow situation at T13 and a checker at S/F, it would have been game on racing.
With a double yellow, the restart is at the green flag or at the next station not displaying a yellow. Since S/F had a checker flag the race is over since the racing wouldn't have been able to resume until After the station. Any racing prior to S/F was prohibited.
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