I'm not sure if he does manual girth exercises. He just posts and talks about ball and penis pumping. u/PumpedHuge has plenty of pics documenting his years of pumping which I think is at least 15 yrs.
I'm probably closing in on 5 yrs.
I did manual girth exercises for years before getting my pump and continued doing so for a long while.
I've started pumping again after a long break and I'm modifying my style so I can avoid some of the plateauing effect.
When you mix pumping and Slow Squash Jelqs together, you will be gaining half inch every 6 months. There is no point pumping for many years. Most people you see that are putting for many years are doing so because they don't have a solid routine. If they stop pumping today, they will lose most of their girth because most of those gains are not cemented. Pumping for 10mins per set is excessive. I won't go more than 8 mins inside a pump per set. The most important thing when pumping is the manual girth exercises.