In fact, this whole debacle has hurt them the most since it seems many/most Chinese authors were excluded by default since the amateur self-appointed censors couldn't actually be bothered to figure out what disqualification criteria would be, just that it could be "sensitive to China."
The organizers are just whoever won the vote to run the conference that year. There's no actual organization that persists from year to year.
Otherwise I could announce a Worldcon unilaterally and no one would have the grounds to stop me.
The Chengdu bid won the vote legitimately. They would have been massively overstepping their authority to try to prevent it. It's unlikely they could have even won a court case if they tried to prevent it.
One could argue that when parties involved have so different population numbers, probably using the percentage of votes relative to a country population, instead of just number of votes would be a better solution.
...as opposed to professional government-appointed censors?