Am sorry to contradict you, but a curfew means there are no activities, plus no one else allowed on the streets.
A voluntary business curfew means that those that want to open, can open, as well that want to close early, can close early.
I don't know if you read the "other forum" in which we are both members, but a monger traveling to Reynosa said the Zona was closed for a couple of days... now it's working again.