010101 Kylo The major qualifications for being in the Extensions tag are being compatible/working on the current version of Flarum, and that the author considers it ready for release. There's no requirements for certain coding/interface styles or translation support for general extensions, though we'd certainly love to see all extensions provide consistency, some devs simply offer their extensions as-is. There are no rules or conventions being violated here.
We'll leave it up to the community to determine if they wish to endorse or install this extension at their own convenience.