Considering some of the teams that Miami and FSU have had, I think I can agree with the article.
It would be interesting to see where all the players starting for every team came from and where the remaining roster players came from.
Unfortunately, not all schools list their ex players in the NFL. Two that did:
USC currently has 30 (out of 40?) players on NFL rosters.
Florida State currently has 42 (out of 62) players on NFL rosters
Not enough info to draw any conclusions though. Also without rally digging, you cannot say that the numbers for those teams correlate to the numbers in the original stats. Some players listed my have been drafted more then 10 years ago for example.
Not a lot of Longhorns on that list but they made a big impact in the NFL this season. ( Vasher, Hampton, Tubbs, R. Williams)
The above stats are why FSU, despite coaching problems and several seasons of mediocre results, will not have problems recruiting any time soon. It has been, and will continue to be a farming system for the NFL. And young high school kids looking at schools will remember this.