well you look at what was there before Noir, you look at what needed to change to make film into Noir, and now you know how to tell if something has been made into a Neo-Noir.
I agree that the ones you listed are all Neo-Noirs. Blade Runner is absolutely a noir, he's a private investigator, there's a dame, he's got a trenchcoat, the ambient is full of shadows. It's so.much. a noir, the guy could be Humphrey Bogart and it wouldn't make it more Noir. And the new Blade Runner was't too far from that, i adore the original so obviously i would have problems with 2049, but regardless even if by imitation, it's still a noir.
And The Crow and Sin City, well, these are, not even "ripoffs of Noir", they are homages. One element of Noir is that, it's dark. It's got a lot of shadows. The style is both in the story, and in the visuals. Seven absolutely is a Noir.
One of my absolute favourite Noir is modern enough that could be called a Neo-Noir, Devil In A Blue Dress -
https://www.imdb.com/title/tt0112857/reference/
Denzel Washington and Don Cheadle playing the absolutely wonderful character of Mouse.
As for "Neo", i think anything that is far enough in time from the original Noir, can be called Neo-Noir.
As for the list, i'm not crazy about it, but i also don't completely dismiss it.
Fargo doesn't have the visual style, but the story does fit.
Pulp Fiction (praise be the name) fits the visual style .. to a point .. but the themes are often too aloof. Noir is about the fallacy of human nature, how we are all damned by our own sins, the rot and corruption isn't just around us, it's in us, it's us.
Casablanca is not on the list. Really.
While the heroes win, at the end of Casablanca, because they manage to get Laszlo out, him, Bogart, doesn't win. He wants Ilsa, but he can't have her. Not because he can't take her, but because he's damned by his own heroism. Because in Film Noir, it doesn't matter if you are good or are bad, you still always lose.
Oldboy is very Noir.
What can i say, it's one of my favourite styles, i'm happy when more Noir are made.
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i need to preface that, sometimes i feel like this guy
but my understanding is that the word "black" was associated with all things criminal, because of what we call Cronaca Nera. Nino Frank was, after all, an italian. European newpapers would print obituaries with a wide, black band at the top - still common today in many countries, just like black is a funeral color almost worldwide, and like black armbands are a symbol of mourning - from whence the newspapers took that, given how black was associated with death, the section of the newspaper that dealt with crime, was the "black chronicle". I don't mean a front-page bank robbery, but just "random guy found shot in an alley", at the back of the paper. And only people with seedy interests read that part.
The same way that the french publisher that did the Serie Noir went with black because black is the color that you use for that type of crime. Throw in that the protagonist needs a reason to be involved to care about the crime, and you got either policeman, private investigator or person personally scorned. And that you can't figure out everything on the first page, so you need the protagonist to see enough, but not everything - nighttime scenes. And you know what readers are buying your product, so you give them more of what they want, tragic endings, loss, misery.
Pulp and Noir are brothers from other mothers. I would say that Pulp was more varied because the point was to create schlock that was specifically targeted at a sector of the reader ship (another reason why i look down on people who read stuff like the Star Wars novels,
@igor_kavinski ), but it was the forge where Noir was created.