There were several articles that stated that DVC was never a part of the National Harbour project.
Not only was DVC never officially a component of Disney's plans at National Harbor,
nothing was officially part of Disney's plan, because Disney never announced specific plans.
The original press release stated, "Disney is considering using the 15-acre site overlooking the Potomac River in National Harbor, MD as the location for a resort hotel for families and others visiting the National Capital Region."
The press release later went of to say, "This new resort hotel, like the project under construction in Hawai‘i, will be in a prime geographic location and will provide guests with the same comfort, fun and amenities for which Disney is famous."
As I wrote at the top of this thread, the Disney project was widely expected to include a DVC resort -- especially considering the line in the press release comparing the National Harbor project to "the project under construction in Hawai‘i." However, even the "fact" widely repeated by newspapers that Disney was planning a 500-room resort was not based on anything that Disney had actually announced.
The big construction project (which became Bay Lake Tower) at Disney's Contemporary Resort was not officially a DVC resort until exterior construction was complete, interior construction was underway, and DVC sale were ready to begin.