The title of the blog post mentions Tailwind Plus so I’m assuming it’s a paid feature. The ambiguity is probably intentional.
If it saves you a bunch of time writing and maintaining the sort of components they are showing off, probably worth it?
Edit: apparently all framework integrations and the whole library and functionality is behind the same paywall? And regular tailwind is just the css classes/build process that I used to know? Do people not understand how casual readers might be confused about all this?