Maybe not directly, but if you like the style, you have some options: https://github.com/HermanMartinus/bearblog/#can-bear-blog-be...

Creator here. You can technically self-host it, you'd just be self-hosting a blogging platform instead of a blog. There are options to self-host other tools with the same theme as other commenters have stated.

Also, "privacy-first" and "self-hosted" are not mutually exclusive concepts. By your logic all software you don't host yourself isn't privacy respecting, which is a fair belief on your part, but opinionated at best.