To get Wikipedia on a data connection without data charges those people would have some mobile Internet device (e.g. a smartpone), and a mobile data connection, normally paid for already.
Now SOME providers in their country offer access to one web site (i.e. Wikipedia) for free (i.e. included in their data plan). Stopping this project, or cancelling existing such contracts, does not cut off those people from Wikipedia. It will just be included in their normal data charges - just like users of the other providers in the same country. Also why would it have to be limited to Wikipedia, and not also say the Encyclopedia Brittanica, and a few international news papers?
I don't see much difference with what is (used to be?) offered around my place for packages that include free access to WhatsApp and the mobile site of Facebook. I don't know if Facebook pays for that, actually I doubt it.
Net neutrality is about not giving preferred access to certain sites, or giving different rates (cost, speed) to access different sites using the same connection or being allowed to access certain sites at all. That is regardless of whether the site(s) in question pay for their preferred access.