Even if Poly 2 is another association, there's no way they're going to tell someone who just spent $25,000+ they can't use the volcano pool and splash pad. It's a major selling point of the resort. The new pool won't be restricted either because it's going to be right in front of the hotel side of the resort like Wilderness Lodge.
Bay Lake Tower is the exception to the rule, but BLT is a secluded property and has a very small pool compared to other
DVC resorts. That's more of a practical issue than anything else. Honestly, all of Contemporary's pools need a full gut and rebuild. They're all disappointing for a deluxe and monorail resort.
Which they won't. Disney completely gutted and rebuilt the Oasis pool when Poly DVC was put in place. That was done for a reason.