It's just the way he words it. I can't wrap my mind around it and fully grasping what he is explaining.
Others have done it, but I'll try to make it simple. As you have some experience, I'll not go too far into details.
1. Find seating depth
2. Find pressure (you can start at almost book max, that makes me uncomfortable, so I do a 1 round ladder as described above)
3. See if it groups acceptably at 100 yards for 10 rounds
4. If it does good on 3, true at range. If it fails 3, drop powder charge 2 grains and try another 10 round group
5. If it still fails change powder and repeat the above
6. If it still fails, try a different bullet and repeat 1-5 above
7. If it still fails, get a different barrel
Of course, the gun needs to be good, no loose screws and such, so the above is assuming other issues have been ruled out in regards to rifle and scope. It also assumes a realistic expectation (light hunting guns are not sub MOA for appropriate group sizes).
You can always try some factory ammo to see if it will group with that.
The above method has worked well for me on 3 different rifles and multiple bullets and powders for each (target vs hunting loads). It makes me willing to change things based on what components I can get.
Of course I've only loaded for Tikkas and mine have not been picky. I did find one bullet that gave horrid groups with all powder types and charges, but everything else has been usable.