There at least 20 posts on this board regarding weightlifting shoes, so I'm not going to repeat myself again. However, this is an interesting passage because it is essentially a series of false statements:
Because of the small feed your knee joint is also moving forward. So the pressure behind the knee caps increases.
Permanent use of weightlifting shoes and hence increased stress would (after years) result in increased wear in the cartilage behind the knee caps. The quads are more trained but the hamstrings, glutes and lumbar spine musculature is more important for the powerlifter.
Those muscles are more activated when using flat soles as when using weightlifting shoes.
The use of heels implies therefore less stress for the back but more stress for the knees.
How is it that when the knee moves forward the pressure behind the patella increases, especially when the hips are moving back at the same time? I have been training for 15 years in weightlifting shoes with a 1" heel and my patellar cartilage is just fine. The quads are only more trained if you don't know how to squat correctly, shoes or not. Likewise, lots of people manage to leave out their posterior chain in Chuck Taylors. And the correct use of "heels" implies that the lifter knows how to squat correctly, thus distributing the stress of the movement evenly across knees, hips, and back, no matter what shoes are worn.
That having been said, I prefer a slightly lower heel for most people because they are easier to pull in. Rogue Fitness has some new lifting shoes with a 1/2"/12.68mm heel, that I just got through squatting and deadlifting in. I recommend them highly.
And why is it that the Germans always seem to sound so authoritative even when they are completely full of shit?