The Poly isn't listed because it's not sold through, which means any data is not especially predictive.
Poly is often available 7 months out, but for fall there were many weeks with holes as of the 7 month date, and early December is also difficult. If it is really important to you to rent at Poly, try to rent before 7 months. The broker may not have points for Poly and it may become a 7 month booking anyway, or you may lose availability.