Correct, for stays at AKV for after September 1st.
I believe the person was saying that for stays at other resorts, the stay must be after September 1st also. So no using your AKV points to stay at OKW in July.
This is the way I understood it from my guide as well. I think the reason must be is AKV will not be available until that date, so points from that resort cannot be used elsewhere. I assume this is because techincally the points are not "valid" (for lack of a better word) until the resort is open.
Oops - sorry 'bout that - I re-read the post and see how this could well be the meaning - thanks for the clarification.