It comes down to a matter of semantics and interpretation whether BLT is "sold out." I have not seen anything official from DVD stating that BLT is "sold out." However, DVD has eliminated all 'publicly advertised' incentives for BLT and is currently selling BLT for $140/point. Thus, BLT is in the same situation as the other 'sold out'
DVC resorts: VWL, BCV, BWV, OKW, HHI, VB, and VGC.
I say 'publicly advertised' incentives because I don't know whether DVD is offering special incentives for BLT for guests who attend special presentations, such as on Disney Cruises, Doorway to Dream sites, or the new Vacation with Character presentations currently being conducted at WDW.
By my estimation, DVD still has about 518,000 unsold points at BLT. However, that number is irrelevant because DVD can decide to cut off sales any time it wants.