I live in Perth Western Australia, arguably more sun than the Gold Coast. Wear fully polarised sunglasses also, and it unlocks flawlessly outside.
Most of his attempts in the sun worked.
Also, he notes
> Oh - incidentally, I'm conscious that the final attempt I made in the car which failed is likely due to too many biometric fails and it wouldn't have passed under even ideal scenarios. That doesn't change all the failed attempts leading up to that, but it deserved a mention anyway.
Also mentions needing to look at the 'thing' to unlock. He could turn off the attention unlock feature to get unlock scanning without needing to look at the iPhone.
Lastly, he keeps swiping up from the middle of the phone which only brings up notifications, to get into the home screen you need to swipe from the bottom.