Not the version described in this article.

Fair. I think this article was written before they released the open version. Deno KV is still in beta. If you're running it on Deno Deploy then it's a paid service, otherwise you have the option of hosting it wherever you like, and connecting to it is still pretty straight forward (a URL + environment variable).

With what license?

(Several clicks in it looks like https://github.com/denoland/denokv is the repo and it's an MIT license.)