I agree that paragraph (especially the latter half) is a bit hyperbolic, but I think the sentiment is relatively true. The B12 is a collection of castoffs in rural or less populated states with institutions that care about football.
While the B10 has gobbled up institutions that are either in big markets and/or the flagship university in a state. Some care about football, some do not, but all are somewhat corporatized.
You also conveniently chose the one school in the Big 12 that doesn’t fit the profile the author described. But the rest of the B12 additions either created or maintained regional matchups (Utah vs BYU, Cincinnati vs West Virginia, CU vs the Kansas schools, Houston vs other Texas schools, etc). None of the B10 additions did that outside of maintaining UCLA/USC and OU/Wash and maybe Iowa vs Nebraska