It is probably a combination of both. If I’m recalling correctly here, that every PE method helps with gains in length and girth; however, there are PE methods that tend to favor gains in a certain area over the other.
For example, pumping will “pull” your penis out and make it look longer, but that effect is only temporarily and lasts a while after a pumping session. Pumping mostly helps with gains in girth than length from what I remember. It still helps with length though. Extenders are the opposite. They mostly help with gains in length, but there are gains in girth. I think with using the combination of both is how he was able to keep his length and girth gains almost identical. There is no doubt about gaining with an extender since there is scientific backing to it.
I can’t answer to dtwarren1942’s question about pumping though. Anyways, I’ve noticed that I gained another 1/16” on my length, so I’m just under 7” BPEL now. I’m thinking of adding Jelging back to my routine. I’m not gonna go crazy with it. Probably just keep it to 10 minutes permanently.
I know you’re getting an extender from prior posts, but don’t feel like you have to do every PE method at once. Just start out with the extender. During my early days here back whatever years ago, I remember the general consensus was that everyone should work on length gains first and girth gains last. The idea is that gaining girth first actually makes gaining length later an even slower process.