I think he means the overall scheme by said coach led to HW getting a lot of carries. UGA was a run oriented offense at the time no matter who was running back. Now, other backs in that era didn't get as many carries of course, some didn't stay healthy, some had steady backups, some weren't on very good teams, so they would get behind and need to throw more. And many could not have carried the load of 35 attempts per game plus some receiving.
Had Walker played on a pass oriented team, he would not have gotten so many carries.
I think this is also important. Obviously
@OrangeAfroMan brought up Jonathan Taylor.
But it's not like Wisconsin recruited Taylor and said "OMG he's so freakin' good let's become a run-first team!" No, they already had a scheme, and an identity, and in recruiting attracted top-end RB talent. Taylor just happened to be so good, and so durable, and didn't fumble, so you just force-fed him the ball over and over.
I don't know much about the UGA teams of that era. But I would suspect it's the same thing. Run-dominant philosophy before Herschel arrives, and then you just happen upon an otherworldly talent who also managed to stay really healthy over three years, and so you just gave him the ball over and over.
IMHO with Wisconsin, the scheme came first, and then they got really lucky with a player who had the exact mix of talent and skills that you didn't even want to give the backup any carries. It was easy coaching, "just give it to JT!" But it wasn't coaching in the sense that they changed their offense to revolve around the run game--they already had that.
That said, it's still an insane volume for Walker, and like Emmitt, I tip my hat to him actually withstanding it.