Oh I'm not aware of the means of using JWT you describe. I think the context of this article is using JWT exclusively, and by the looks of things plenty of people are doing just that.
The article specifically addresses the confusion that you're exhibiting:
>A lot of people mistakenly try to compare "cookies vs. JWT". This comparison makes no sense at all, and it's comparing apples to oranges - cookies are a storage mechanism, whereas JWT tokens are cryptographically signed tokens.
There's no such thing as "JWT exclusively". The JWT is just a chunk of data; it has to be stored somewhere, either in a cookie or in local storage.
JWTs can be stored in cookies. So I don't understand why you say this.