DL flies to MNL from NRT and NGO connected from US. KE connects to MNL through ICN from US. So it is not necessary to go through HKG to get to MNL.
HKers will all be travelling and HK will be full of tourist from China.
The cancellation of Thailand tours/trips are with the HK travelers since Thailand is a popular destination for CNY vacation. HK travelers are a paranoid bunch with any not so good news from their intended destination.