Hi from Brisbane JJ. I'm no expert but this is a very common type of cancer and it something any ENT would diagnose every day.

I Googled myself to death during my diagnosis. Survival prognosis, complications, treatment side effects, and worst of all of course is doing image searches. I came to the conclusion Google can't help you with the diagnosis but can do a great job scaring the pants off you. There are cancer factors that might look like they fit your case but often there are other factors that may not be in that article that the ENT uses to eliminate that diagnosis.

I've found Google can be useful for processing and understanding what the doctor is telling you. There is a LOT of information and concepts to absorb with cancer treatments.

You can always get a second opinion, but I'd be very surprised if an Australian ENT specialist did all those tests and missed something as common as a HPV cancer.