That's essentially what has happened. As CarolMN mentioned, there is no way that the treehouse points will all be sold out before members can begin to book in February. Rather than turning the rooms over to CRO for cash bookings, DVC kept some for use as a sales incentive.
A similar series of events will happen at AKV Kidani and perhaps even the Bay Lake Tower since they won't be 100% sold before opening. Dozens of rooms at those resorts could be filled with cash guests from Day One if all of the points are not sold. The only difference here is the way in which the incentive is being marketed as a "priority booking."
As I understand it, people who received this treehouse sales incentive get a free 3-night stay. They have a period of 15 months over which the stay may occur. Over those 15 months there are 27,000 nights available in the treehouses (15 mos X 30 days X 60 villas = 27,000).
Even if DVC were to sell 500 or 1000 contracts with this incentive, it would only be a drop in the bucket (1500-3000 nights out of 27k.)