If you have anything better (or even equally accurate), I'd be glad to check it out.
Yes they did; and here's the thing about that. If you look into that statement you'll see that it covers all of NOLA, not just the schools taken over by charters. To my knowledge nobody has broken down (or published) the data far enough to see if there is any measurable differences between the improvements in the remaining public schools and the new charter schools. My guess is that, like the vast majority of charters, there isn't any real difference in their testing scores because if there were, one side of the debate would be seizing on it as evidence.
Another thing to note about the N'awilns case (which was admittedly probably a bad example for me to have used because there are so many odd variables) is that when the agreement was put in place the city had two caveats; one was that the charters had to be operated by non-profits and the other was that control had to remain local. These are two things that are very atypical with most charter privateers, most of which are definitely profit-driven with no ties to the local district.
So basically what we have is an absolute best-case scenario in NOLA, with the worst schools in the US struck by tragedy and then being administered by local charters who aren't driven by profit. And still with that best-case scenario, there's not likely any difference in the results between them and the more traditional public schools.
The profit-driven charters who are only interested in stealing public money are not going to have even these negligible results when they implement their plans to toss out professional teachers and replace them with untrained wage-slave babysitters and focus their efforts on nothing but drilling students on standardized testing scores so they can claim "improvement". Meanwhile some self-interested jackasses are going to be raking in your tax dollars while your kids are given a McDonald's level education and communities are losing local control of their schools to people who are going to bail on them the second things get tough.
Don't fall for it, man. These mercenaries are beneath your support.