I don't think that is the reason. The HKG situation was unfortunate. As far as I know this was not the fault of MAPLC or at that time CX but as a result first of an objection from BMI and then problems with the Russians.It must be remembered that it wasn't just the airport who announced but also CX who had the flights on sale
The airport doesn't even announce anything these days even when it happens.
I suppose they might if it was big enough but as I said before they have never announced ED and neither have they said anything about cargo by GWL JX and FDX even though they have started.
Viscount