I think you misunderstand the document. Kinetic energy is what causes tissue displacement... more energy, more displacement. That is why a 40gr Nosler Ballistic Tip out of a .220 Swift is a lot more explosive on a prairie dog than the same projectile fired from a .22 Hornet and traveling 1,200 ft/sec slower. Kinetic energy matters when it exceeds the elastic strength of the tissue it's fired into... again the difference in a headshot on a deer with a .22 LR and the .220 Swift is significant because in the latter case it exceeds the strength of the deer's skull to contain it and blows the skull apart while a .22 often doesn't exit. Similarly, something like a 6.8 Western with long VLD bullets that retain velocity and energy at longer ranges also retain more kinetic energy and the ability to create more tissue damage. Lung tissue is not elastically resilient, as anyone who has shot a deer through the lungs at close range with a high velocity centerfire hunting cartridge knows. For instance, I shot a 130 lb 18-month whitetail forkhorn broadside at 40 yards through the lungs and heart, using a .30-'06 150gr Remington factory Corelokt cartridge with a muzzle velocity of over 2950 ft/sec, passing completely through the chest cavity and blowing a silver dollar-sized hole out. While the heart had a good tear, it was substantially intact, as you'd expect from highly elastic muscle tissue. Both lungs were reduced to a liquid pulp with no structural integrity, like jello through a shredder. The deer ran about 25 yards, then collapsed and died, from blood loss and consequent lack of oxygen to the brain. A deer struck in the same spot by, say, a .38 Special 158gr HP bullet at 900 ft/sec would have mostly intact lungs, less heart damage, and the bullet likely wouldn't exit, and chances are it'd run a lot further before succumbing to blood loss.
Similarly, I had a roommate in college who drove an ice cream truck in New Orleans (this is back in 1980). He was robbed at gunpoint, complied, but remarked to the robber, "That's not a real gun, is it?" and was shot in response. The bullet, out of a .22 LR revolver, struck him through the chest, passed through his lung, and lodged in the muscle around his shoulder blade. My roommate jumped out of the truck and took off running down the street, collapsing a block away due to his inability to catch his breath (his lung collapsed). He made it to the hospital, went through surgery to fix his lung and remove the debris dragged inside him by the bullet, and the bullet was extracted. He was out of the hospital in less than a week. What do you think the outcome would have been if he had been shot with a 40gr .22 Nosler Ballistic Tip out of a .223, or a .220 Swift, in the identical spot? I think he would have dropped on the spot and died very shortly thereafter. The difference is, kinetic energy and the resultant difference in trauma.
That's why, for long range deer and elk hunting (beyond 500 yards), I'd choose the 6.8 Western over a .270 or 6.5 Creedmoor or PRC. YMMV. I actually have a 338 Win Mag that I use for elk, but it's a heavy rifle... not bad to shoot, but it takes me a couple of days of lugging it up and down the mountain to get used to it. I wouldn't mind something lighter but with less felt recoil and a flatter trajectory.