In 2019, they announced they'd be "merging" with argocd[2]. It seems the merge never really took place, and after that they deprecated flux and announced flux2[3].
The sudden changes of course were a little confusing and perhaps not too well communicated.
1: https://github.com/fluxcd/flux 2: https://discuss.kubernetes.io/t/flux-cd-joins-forces-with-ar... 3: https://github.com/fluxcd/flux2