Russell was vastly better than Turner as a freshman, so I don't know if that's a useful comparison.
I think the point was -- and I do not know or watch enough college basketball to confirm -- is that Ohio State play a weak schedule (relative to other big teams) and that their player's stats tend to be inflated because of this. To get a better reflection of the individual player's talent (to better forecast how well they'll do in the NBA) you want to isolate and analyze how they did against strong teams + teams with NBA caliber athlete / defenders.
This was one of the big red flags on Evan Turner prior to the draft. He struggled badly against teams with NBA caliber defenders was seen to be padding his stat lines against weaker sides. This was the best forecast I saw for Turner struggling (as aa #2 pick and All-Star hopeful) in the NBA. I undervalued those struggles at the time and I wonder how much weight I should put on Russell's worrying stats noted up above. If anyone watched any of those games, I'd be interested in what they have to say about Russell's performances there.
Does he have problems creating dribble penetration against NBA caliber defenders / athletes? Does he create separation well enough to get off his (beautiful) jump-shot to score in one-on-one situations? Was the problem that he was playing PG? Will he fare better as NBA SG? Does he do better or struggle against smaller defenders (PGs, combo guards) or bigger defenders (wings, SG / SF)?