> but if they're seeing the dark side of the moon then i assume they don't have line of sight to Earth

No, you can see both the dark side & have line of sight to earth, at the same time. The key insight, probably, is that they're not behind the moon (yet) from Earth's PoV, and/or "seeing some of the dark side" vs. "seeing only the dark side"; currently, they are seeing only some of the dark side, assuming I'm interpreting the tracker correctly.

See [this tracker](https://issinfo.net/artemis.html) for a diagram of their position.

Currently, the arrangement is like this:

                 ⌝ toward Earth
               ⋰
        \    ⋰ 
         \ ⋰    ⦙
     Moon *      * Orion 
           \     ⇣
            \
        (moon's orbit)

The line I've put here is the moon's orbit. Everything ⬃ of the line is the dark side, as it faces away from Earth. From this diagram, if you drew a vertical line through the moon, Orion sees the right half. Some of that is what the Earth sees, and some of it is not — the portion that isn't is the dark side.

(Also note that "the dark side of the moon" is a specific term meaning the far side of the moon, not the literal dark portion. The "dark side of the moon" is lit 50% of the time.)