I bet they'll still let you in mate. They're just trying to justify their stance. It actually DOES make sense for them to be taking care of non-white minorities first, since many locals treat white people (of any ethnicity) like they are worth their weight in gold. Personally, I think the classes should be open to everyone, and people should be entitled to pay what they think is fair (as long as they pay a certain minimum). That way, if an English banker who makes $200,000 a month takes one of William's classes, he should (out of the goodness of his own heart) make a donation to ISS so they can help more people. Just my yi ho jit.
BTW, what I learnt from William has helped me teach hundreds of local school kids how to speak and write English better.