I'm going to be bold and tag this with 2 extra tags, since I believe this task would be under the scopes of both of those. I'd like it better to have some confirmation first on what should be done by any relevant members, and if they have something that replaces this Gerrit repository.
If this isn't actually under there scope; I apologize and whoever finds this to be inaccurate can feel free to remove it.
Yes, this theme is not longer in use since 2014 (see also the notes at https://meta.wikimedia.org/wiki/Wikimedia_Blog#WordPress_Theme ). We should continue to provide a published version that reusers can download, but I understand that this will remain possible after archiving the Gerrit repo (correct, @hashar ?).