While Howard Springs is hardly remote, if it did escape into the community, the economic cost of shutting down what is really a fairly minor population centre would be far less for the national economy, and "only" impacting 150K ish people.
I think the real success of howard springs is the fact that its not a hotel - with risk of transmission is greatly reduced, with individual cabins with their own air con. The nebulizer incident would be far more unlikely in this setting.