One of the things that comes up again and again as a point of conflict in these discussions is the difference in perspective and experience between people who use hand planes to do minor adjustments or final smoothing, and people who use hand planes for everything.
In the first couple of minutes the video shows the maker using a chopsaw and a power mortiser. I suspect they are not flattening and dimensioning rough lumber with hand planes.
Warren is coming from the perspective of starting with rough lumber, and doing all of the preparation by hand. Not everybody needs to do things the way he does, but his observations are not vacuous, idle, or baseless. They are worthy of respect, and can help even those who do not work the way he does.