He was a real hardcore trainer though..give him his dues.
Definitely, if the things written on his training wasn't total bogus, he was the ultimate volume trainer, working on three-day split!, and he was strong, he was using good poundage even on that kind of volume.
I strongly believe that one can enhance their ability to handle high-frequency training, so claiming that excessive volume will inevitably lead to overtraining is inaccurate. Some individuals are naturally gifted with a high aerobic capacity, allowing them to further develop it.
Multiple Mr. Universe Ahmet Enunlu was also a high-volume trainer, and he was a specimen, physically very strong and athletic all around, and he was not a big man in bodybuilding standards.
I guess looking at all those pictures distorts our perception, most of those golden age champs combined strength and endurance, otherwise you end up being stringy on the stage, to keep up the size on very low body fat, without solely relying on steroids, you need a very good base, and iron age champs had that.