No.
This statement was made by a former member of the NaNoWriMo Writer's Board, which is not the same thing as NaNoWriMo's Board of Directors. The person who made this statement positioned themselves as someone with knowledge of the matter, and authority. However:
- Membership on the Writer's Board is an honorary position that is mainly symbolic
- Writer's Board members play absolutely no role in the governance of the organization
- Writer's Board members do not have insider access to information about the organization
Please take the time to read this FAQ, which talks about how NaNoWriMo does not harvest users' creative work or information and this other FAQ about how 18+ users don't even type their work into the NaNoWriMo website. Writing inside the interface is an optional feature of YWP only.