I get what you're saying, and the winning has always been the argument used, but it can't be ignored that Russell also played for the best NBA executive of all time that consistently made sure he had the best group of players around Russell.
If Russell shot a great shooting percentage while shooting way fewer shots, then I'd say we throw out his offensive stats, but I don't think the plan was for him to miss nearly 60% of his shots. And if you look at the foul shots attempted compared to fga, it's clear Wilt was the tougher guy to defend while still being an elite defender himself.