There's more to it than that. There are two resources involved. One is using Ghost's (jsdelivr-backed) CDN. The other is just using jsdelivr's CDN for any and every NPM package that gets published in the clear.

The asset that thefp.com is using is the one that gets loaded from the latter (the one served from the public CDN), and you can see that this was true even at the time that O'Nolan's screenshots were taken. For some reason, he mixed them up; the only evidence that we have of anyone here using the CDN that Ghost is (presumably) paying for is Ghost's own use of it themselves.