Teaching and education metrics are really screwy in any case. It’s hard to measure change over such a short time, and you should be suspicious of any purported change.

Teaching kids to write to some test is not the right approach in any case.

Change takes time and money (and hopefully skill) to change. Come and report back in 20 years—if Lebron et co are continuing to put money into this endeavour over a long time scale, hopefully it will lead to permanent change.