ATK/CI, Kenji, etc - they all have said that many times they're talking about best results. It's often possible to cut corners from what they say and get perfectly reasonable results, just not as ideal as one could.
Also FWIW, my recollection of the pork belly episode was the same, that they said you'll never get as good of a crispy crust without frying. That's not the same as it's not possible to make it happen at all. I remember thinking "well, I'm not gonna bother with that".