Not only that, the writer makes a logical fallacy by assuming that if x didn't happen then y wouldn't occur. That's similar to the people who claim for example that if Jackie Robinson hadn't have been a success, there would be no blacks in baseball. Apparently many people fell for that sort of nonsense. The fact that a number of clubs had been itching for the opportunity to use black players and that integration into baseball and other big league sports was inevitable totally escaped them.
If the British had been able to quell that rebellion, rest assured many more would have followed. There was no way the British government could keep the American colonies from eventually becoming independent.