I liked a couple things from the video though. One was the way he used the chisel at an angle to cut the whole knife wall (what he calls a first class saw cut) pretty quickly. It’s easier with the chisel he has, but any bench chisel could do several inches in from the side of the board. The stair saw method does have the advantage of very even depth saw cuts. Maybe using a longer bench hook placed on the other side of the bench would make cutting on the pull stroke easier.
The other thing I liked was his mention of shimming a dado plane to make a housing dado of the width you want. It’s another interesting way to do it. I don’t have any dado planes, but I might not turn one down if I saw a really good deal.
And man, every time I see one of those hand crank drill presses in someone’s video’s I want one more and more.