BDiONU - I believe the Notamed closures are planned around the scheduled movements (ie: when none are scheduled) but the flight in question was delayed and was then ready to depart during the closure period. I suspect that these "headlines" that appear from time to time are exacerbated by the flight crew who tell the passengers that "We can't go yet as ATC are having a tea-break" (and I quote that from personal experience) rather than "We can't go yet, this flight was delayed due to (X) and ATC are now temporarily not available due to the LEGAL requirements with regard to rest periods"
DD