Yes you could do that at 7 months. But so could anyone else with unrestricted points.
One other question I notice you asked, about booking at RR if sales are slow.
Firstly, sales are pretty much progressing as Copper Creek did. It’s a lot, lot bigger, so lots more points in total. But DVC only sell in batches.
They have to “declare” a certain number of points and they can then sell those points; each batch is essentially a group of rooms. Those batches are the rooms that DVC then release for booking through points. So they can only take points bookings for the rooms they have declared. Although it isn’t specific room numbers, just rooms to the value of the points declared. So it isn’t actually easier for members who own elsewhere to book, since only owners at RR can book at 11 months and they can only use their actual RR points to book. At 7 months, any owner can use their points there, and resale points bought pre-Feb 2019 can also be used.
The rest of the rooms can be booked through WDW like any other resort: POR, All Stars etc. So it means until the resort is sold, it’s DIsney, not DVC, who have more rooms available. Hence the AP discounts for staying there, for example.