That is a great video for people doing the 3-in-1 planting hole technique or have a small backyard with lots of trees. Thanks for posting it.
I have read a lot of pruning books. By far the best was suggested by a friend. it has taken the guess work out. Easy to follow and easy to apply the technics. Particularly helpful for apples and pears.
The royal horticulture society encyclopedia of Practical Gardening
Christopher Brickell
Pruning
isbn 0 85533145 3
teaches you to prune everything roses, shrubs, fruit trees and trees
Kevin Graf have many good videos for managing backyard fruit trees on YouTube. Worth checking them out.