The video is describing the same process as the OP, and regardless of what some guy puts up on his blog - I do not believe that this process is a sound reloading technique.

All of my concerns listed in my first response stand true for the video as well.

You've watched the video - he references a 10thou jump, AND he references that he can see that his bullet has markings from the lands. Take a look at the edge of a 5 thou feeler gauge, hold it up against the ogive of a bullet some time - that'll give you a feel (pun intended) for how long a witness mark has to be on a bullet to be visible to your eye. So if he has a 10thou intended jump, but a 3thou witness mark left on his bullet, he's really only jumping 7thou. If he uses the same case (as he did in the video) to repeat the test, and he's pushed 1thou less neck tension by resizing the brass or bullet ever so slightly, maybe the next measurement will show 2thou less witness mark. Or maybe it'll hang on the lands just a tiny bit and pull back 2thou...

Or say next week, you do it again with a different bullet and you size a different case that doesn't have the same neck tension, and it might produce an entirely different result. If the new neck has been work hardened a bit more than the other, it might resist slip a bit more than the first case and push a bit more "kiss" onto the bullet - call it 2thou, so then you're looking at 2thou longer COAL measured on that day.

And for what it's worth - COAL really isn't that important anyway. I'd rather have a batch of ammo with 1thou or less variance in ogive-to-base length and COAL's all over the map instead of have a bunch of ammo with perfect COAL's and variable tip damages that put my ogive position and bullet jump all over the map.