If the SI tell skippers a fixed number of laps, that's the responsibility of each skipper to count their laps themselves. Not the RC. The RC sees a boat cross the line and simply honk to notify the time was duly noted.

If one competitor got it wrong and all the ones behind follow like sheeps, all the sheeps should be disqualified with the one who got it wrong. But that could only be decided by a protest committee.

None of the sheep should be allowed any redress whatsoever. If you are a competitor in that race who got it right and your race was thrown out, you should protest the RC.

Unless I'm reading that report wrong, or there are some facts I've misinterpreted from the short report, throwing the race away is against the rules.