He may have been a QFI, but did he at any point mention the tailwind? Did he at any point attempt to regain control of the aircraft as Captain?
Because if he did, it doesn't mention it in the report.
I accept that being royal doesn't endow HRH with 'magical powers' - despite what the fawning character played by David Walliams might say, and yes, the only person in the cockpit that nothing stuck too was the 'HP' - but I'd really like the senior guy in the front to speak up if things are going wrong, and he didn't AND he signed for the aircraft.