I would guess that Gijs, its maintainer, have been too busy with life or that there is some technical issue which causes him to not be notified.
Edit: Spelling
Low-level flying — It's all fun and games till someone looses an engine. (Paraphrased from a YouTube video) Improving the Dassault Mirage F1 (Wiki, Forum, GitLab. Work in slow progress) Some YouTube videos