I doubt any of the community can offer any assurances on this.
While there is some good feedback previously on what may be your circumstance wrt travel insurance, the best reply would be that of the insurer. It may help to ask them if you are covered for losses, or changes due to the current disruption, if it continues as is? The insurers have their own standards/interpretations of events!
If the situation changes the insurer is unlikely to speculate. Cover may be excluded, or the circumstances considered by the insurer insufficient to cause a change. However if on arrival in HK things get worse, you may find you are excluded from cover. Hence DFATs current advisory.
It is worth considering time may be the key strategic weapon for all with the situation in HK.
HK has been a significant tourist destination, hence your proposed visit.
It would seem reasonable to expect Cathay Pacific and WendyWu Tours to organise around the situation, if they value their reputations. It’s their decision, not the customers?
The Hong Kong tour operator if prepaid may feel less immediate pressure, although all the tourism dependent business in HK will be under pressure.
Your comments suggest you can reschedule the HK tour. That is great if it is necessary. Assume there is a minimum notice period to reschedule or cancel?
Hopefully you have a reliably and trust worthy TA. And all is resolved peacefully and you can still look forward to a great trip.