They may be retired by now, living abroad or speaking anonymously with a journo checking their former identity as JA's teachers. That said, no one wants to be called a racist so they might say nothing.Official teachers prob would be wary of entering the fray.
As for the GDD at 3, it's possible that that is true but there are specialists that can help a child to catch up in that case. There are now and presumably in the 90s too when JA was at school? Anyway it doesn't have to be a lifelong deficit. Some kids can catch up on their own too.