I think they are referring to loading it from a global CDN.
Yes, those aren't cached globally any more.
https://arstechnica.com/gadgets/2020/12/firefox-v85-will-imp...
https://developers.google.com/web/updates/2020/10/http-cache...
https://arstechnica.com/gadgets/2020/12/firefox-v85-will-imp...
https://developers.google.com/web/updates/2020/10/http-cache...
I do agree 30k is hardly worth thinking about.