I believe you're asking if the Iris Unlock and Fingerprint Unlock can both exist as an unlock option at the same time so you're free to choose whichever one you want to use whenever you want?
Kinda like... normally, you would want to use the fingerprint unlock, but on those days when its raining and your hands are wet, you can simply swipe up to activate Iris Unlock instead?
If that's what you're asking, I believe YEP it can!
If you take a pause at 03:04, on the unlock screen that he has, there's this message that says,
"Use fingerprint to unlock or swipe screen to use iris instead."
It looks like the reviewer has both set up so he's free to use either option as his choice.