I checked and found the text of the executive order (
https://www.governor.ny.gov/news/no-20268-continuing-temporary-suspension-and-modification-laws-relating-disaster-emergency), which doesn't appear to have been written by a big lamdan.
The relevant passage says:
Based upon the severity of the cluster activity, the Department of Health shall adopt in the most severe, or “red zones,” the following mitigation measures ... the local Department of Health shall direct closure of all schools for in-person instruction, except as otherwise provided in Executive Order.
It seems clear that the intent is to say that all schools located in red zones must be closed at this time. But if the school "reopens" in another location that's not a red zone, is that actually a violation of the spirit or letter of the executive order?