I don't find the article particularly interesting. It highlights the same underhanded tactics that pro-socialist groups like the Violence Policy Center have used for decades.
The group's talking head, Tom Diaz, doesn't convince me that he was ever in favor of second amendment rights. His ready willingness in the past to jump into the federal level of the anti-gun debate colors him as just another mercenary lawyer following the opportunities and riches he found in DC.
This man assumes we all buy into the anti-gun divide-and-conquer tactic of separating hunters and sporting shooters from defensive shooters. He just wants his lobby to have access to anti-gun data which is irrelevant to 2A rights.
There is nothing new in this article. Looking beyond the article's page, its source publication is questionable as well - certainly not a balanced media source.