1. V Australia doesn't exist anymore. It's now Virgin Australia.
2. Virgin Australia don't fly to HKG. Virgin Atlantic do, but that is a different airline/company so you need to go to virginatlantic.com for that route.
1. VA will be codesharing at least on the SYD-HKG leg
2. If the codeshare hasn't been loaded yet, I would expect the website to not allow me to search for the route (this is something that the previous website(s) did - i.e., if a route didn't exist you couldn't search for it)