The rules have changed. They have benefited offenses.
The "prove it" part is people skeptical that the game has so dramatically changed that you can mostly ignore defense by putting forth the two extreme outliers in Ohio State and OU as conclusive proof.
I never said that. Other posters have. I said you need good defense to win a championship but you cannot win with defense in the same way as you did before. That is about the extent of it.