The projections don't include third-tier television rights, which the schools control and, in some cases, garner serious side money. (Texas and West Virginia are both reportedly over $9 million per year.)
Is this accurate? 
I think it's an accurate number, but it's comparing oranges and tangerines.
In the Big 10, all TV rights (Tier 1, 2 and 3) are owned by the conference. Outside of that, the Big 10 schools have "Tier 3" contracts for things like their radio networks, coaches shows, in-stadium signage, etc. I think I read that Ohio State's Tier 3 contract is worth approx $11 million per year, and none of that $11 million is for televising anything.
WVU's "Tier 3" contract includes televising 1 football game, 10 basketball games, a radio network, coaches shows, etc, etc. In other words, even though WVU has a contract worth $9 million per year for Tier 3 rights, only a very small portion of that is for
Tier 3 TV rights. If the Big 12 started a conference network and WVU was no longer able to televise a football game and some basketball games on their own, they would still have a Tier 3 contract worth about $7+ million per year.
It's almost impossible to compare the conference distributions at these other conferences to the Big 12 unless you know how much of each Big 12's Tier 3 contract is specifically for televising a few athletic events. How much of K-State's contract with Learfield is for the handful of basketball games that get put on FS-Kansas City, and how much is for the radio network and the LHC Bill Snyder show? If you know that breakdown, then you can add our conference distribution plus our third tier TV rights and compare to the conference distributions in other conferences. If you don't know that breakdown, you can only do some estimates that may or may not be accurate.