I think he may be talking about a really tight circumcision that didn’t leave enough skin to allow him to get fully erect without it pulling and limiting his fully erect size/shape.
If that’s the case, your best bet is to look up foreskin restoration. That may help regrow some shaft skin.
I had a tight foreskin, both the opening, as well as a short frenulum.
I stretched the opening throughout my childhood, first by pulling the foreskin back and holding it in a stretched state, then eventually when I could get 2 fingers in the opening I started prying it open, little by little.
Later, in my teens, I tried over years to stretch my frenulum, but never sufficiently to fully stretch out the foreskin, so wearing condoms was painful and uncomfortable because the foreskin would bunch up behind my glans.
Eventually I had a urologist perform a “frenulum release” or “frenulum tying”, which severed the frenulum and totally freed my foreskin. I made a thread about it about 15 or so years ago in this forum.
STARTING: BPEL: 5.9in EG: 5.0in
2018: BPEL: 6.7in EG: 5.3in
NOW (start 1/2024): BPEL: 6.9in. EG: 5.4in