I don't use twitter, but has anyone responded to the facts in his letter by pointing out that if there are currently ~253k nonpublic school students, and "dozens" of current and former students/parents have complained (let's be generous and say 36, 3 dozen?), and you figure the subset of the population they're drawing from must be at least 2-3 million, what you actually have is a ridiculously tiny percentage (~00001%) of current and former students complaining about the education - which is possibly the highest praise ever!
According to their own complaint, what other education system can boast of an accomplishment like that?