As mentioned previously, the KVS Tool incorporates 3 different sources of SQ Award Availability, including the expanded Award Availability that is accessible to SQ's own FFP members. It is extremely unlikely that the expanded BD DC availability (if any) will be more favourable than that.
Speaking of which, has there actually been any official conformation of its existence?
Actually, it is more extensive on certain routes and certain times. No official statement in writing, but a number of members have had it confirmed via DC (Pre Travel Support and the ICC) that there is special inventory.
Similarly at times when I have spoken to the ICC for inventory, it has been in excess of what was available to SQ members. Very unusual, but for whatever reason a deal has been put in place and DC members are benefiting from it.