The catch is “in sunlight” that was omitted from the tweet:

Depending on their launch date, the crew of NASA’s Artemis II mission may become the first humans to see regions of the lunar far side, like Mare Orientale, in sunlight.

svs.gsfc.nasa.gov/14992/

I guess their logic for the tweet is they technically couldn’t see it since it wasn’t lit? I do know they are capturing information in new details they didn’t have before because of the lighting. And I also imagine the dark side of the mook was essentially completely dark