According to the way NYC interprets their law, the knives pictures ARE considered gravity knives/switchblades.
That's the whole issue here. People are buying and carrying the typical one-handed opening locking knives that are sold all over the place, then getting arrested in NYC for carrying a switchblade/gravity knife. Guys that carry locking razor blades for their work are getting arrested and charged.
Can someone in NYC confirm this? I lived there for more than a decade, carrying various types of knives, and even had occasions to compare knives with cops. Neither I nor any other knife-carrying New Yorkers I knew got arrested for this. Some of these people were carrying clearly tactical knives barely within the legal limit (as I understood it). Now as I write this I recall, years ago, checking with a police officer, who clearly knew the difference between a folder and a gravity knife or a switchblade. But that was ten yeas ago.
I am inclined to think that the person who wrote the caption for the picture could not tell a legal folder from a switchblade. Either that, or the image was "for illustrative purposes only." (BTW, unless I'm mistaken, I see one or two switchblades in the picture.)
-- Da Bing