I think what Lemond said makes perfect sense - I agree with @Unchained. He also makes a good point about the recent move to narrow bars which are more aero and save watts. Heavier arms and shoulders don't help win grand tours. And I have noticed a difference not just in climbers build but the build of most riders in the peloton.Not sure actually. Reducing muscle mass also reduces sustainable power. Unless Greg was indeed doing a lot of excercises for pure muscle strength and mass, which is atypical for GC climbers. Generally I can't see much difference in climbers build now vs the past (except a few powerful bulls from the EPO era).
Reducing muscle mass in the legs reduces sustainable power. But that isn't what has occurred. Look at Vingo, he clearly has thick legs but an emaciated body. With Pog we did notice he seemed to lose upper body weight for 2024 compared to 2022 and 2023.
Another example: A few years back it was noticed Richie Porte became more gaunt looking, Porte wasn't a big rider but obviously Porte lost upper body mass - and he finally secured a podium at the 2020 Tour with a great ride in the stage 20 TT. on LPdBF. Porte's well known crack didn't happen.
Not sure if its the right word but the less "nonfunctional" weight to move you on the bike the better. Functional weight are the muscles used to develop power for climbing and TT - sustainable power. Unnecessary muscle detracts from watts / kg just the same as excess fat.. And grand tours are three weeks. Every nonfunctional gram you have to carry around for three weeks adds to cumulative fatigue and detracts from recovery.