CGNAT providers are not ISPs. They're web service providers, WSP.
As for incorrect? How so? Perhaps "web service providers" is a bit glib and incomplete too, but it gets to the core of the issue here: ISP not providing internet service and only providing a limited subset. if the 'web' works that's all that really matters for advertising and getting people to pay them. Meanwhile most people aren't even aware of what they're missing and their inability to participate in the internet; but they, and especially their kids', educations are stunted by the lack of being able to participate, etc. And all of society is worse for it.