Harmony Science Academy - MORE fake advertisement "100% graduation rate"

The schools say they have a 100 percent graduation rate.”

Harmony Science Academy, Houston: The class of 2008 started out in 9th grade with 47 students. In 10th grade it was 44, 11th grade 35, and by the 2007-2008 school year the class was down to 31 twelfth-grade students. Many education researchers would argue that this implies a graduation rate of 31/47 = 66%. In fact, some would say that an additional correction should be made for the fact that the total enrollment in the high school increased from 129 to 151; making such a correction would give an even lower graduation rate.
This is not an isolated example:
Harmony Science Academy Houston – class of 2009. Started with 47 9th graders in 2005-6, ended with 37 12th graders in 2008-9 (79% graduation rate).
Harmony Science Academy Austin – class of 2009. Started with 24 9th graders in 2005-6, ended with 13 12th graders in 2008-2009 (54% graduation rate).
Harmony Science Academy Dallas – class of 2009. Started with 44 9th graders in 2005-6, ended with 14 12th graders in 2008-2009 (32% graduation rate).
(All enrollment numbers came from the National Center for Education Statistics.)
Clearly these schools have a large amount of attrition.

. Why didn’t more of those ninth graders stay in the schools through 12th grade? Where did they end up – as dropouts or in another school? The claim is that the schools’ goal was to get all the 9th graders into college; a necessary step towards that goal would be getting them through 12th grade.
We would also have appreciated an independent confirmation of the claims regarding the waiting lists. The schools have a powerful incentive to inflate these lists, and there is no outside agency checking on them