Flex, I don't really understand your post. You can use staff travel right now. I haven't left HK but I know people using both the freight benefits and flying in and out on Staff Travel. As always, if a flight is full or weight restricted you won't get on. Nothing will change.
At the same time the "bubble" was a joke. They should follow Singapores lead and just treat it like a flu now and get on with life. The rest of Asia is seeing a massive spike happening over the last month. Won't take long and someone from the mainland will bring it right into CWB or TST and it'll run wild.