Looks to be a simple gathering and collection of the actual text from the state statutes. Good find.
Though, keep in mind that the ATF's mission in life is to control access to weapons. There's an incentive to paint things in a more controlled light than otherwise, simply based on that fact. While the text I viewed seems intact and unaltered, it's still not unreasonable to use this merely as an indexing guide, and to instead get the straight facts directly from the actual state legislature's publication of statutes.