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To me that just reads as "development has ended."
Which it kinda has for Factorio, because their current development branch is unreleased, the whole 2.0 expansion pack thing.
I figured there was an explanation like that. I also thought maybe they just had parallel version names for stable and experimental. Still reads funny to me.
I recommend you read the FFFs if you want to see the devel branch. I'm a little behind but it's amazing and exciting.
Factorio FFFs and Zomboid ThurZdoids are that things that are very satisfying to read during the very very long breaks between the updates.
I'm pretty sure hotfixes are still being released. It's more so that there are two release streams, stable and unstable, and when there isn't a new unstable release, the unstable stream is just on the same version as the stable stream.