Having known, personally, people working at the NRA, I can say with near 100 percent certainty the article is a blatant lie.
The NRA has compiled a list of people who-- now wait till you hear this dastardly plan-- have signed up for a membership in the NRA.
WATCH OUT! If you sign up for a membership they will keep your name and address (probably email and phone number!!!) ON FILE!
NRA's lists are far more than that.
NRA actively purchases mailing lists from magazines, organizations, and companies like LL Bean, Land's End, etc., or places where you think that the customers would be more amenable to NRA's message than, say, the members of Drum Circle Quarterly.
NRA maintains databases not of just current and former members, but also of POTENTIAL members.
Otherwise, how the hell would they actively grow the organization?
But, mailing lists at NRA are a one-way street.
They buy them, but NRA policy is to NEVER, EVER sell lists of current, former, or potential NRA members.
That was the policy when I was associate editor of American Rifleman, and had been for years, and to the best of my knowledge still is.
At one point about 1992 they floated a proposal for selling lists of FORMER NRA members to like minded organizations (IOW, they would be very picky where the lists went), but the reaction was quite immediate and quite vicious. It was quickly dropped.