The question now would be how much improvement would there be due to actual new methods in delivering the education vs just pouring money onto the problem and cherry picking your students.
They did seem to open the school in a place that could benefit from it as far as the silicon valley area goes, EPO didn't receive as much benefit from the valley as some other areas, Belle Haven is a mixed bag with it being quite popular with silicon valley folks that are looking to find a big enough house for a family but can't afford more sought after locations.
The only grief I really have with this program is that they did not publish their acceptance policy online which doesn't bode well for transparency in that aspect, so cherry picking and gating might be a problem here as well.
Their management team and staff has more accreditations than some school districts combine probably, they have a huge capital investment, so the school should do rather well, but I'm really not sure how much impact it can have in the long term.