Okay, I've seen it now.
It is Red Dwarf, but it isn't Red Dwarf.
It wasn't filmed in front of an audience, so there's no laugh track at all. It very much looks like a film as opposed to a tv set which, comparitively, is quite flat. There's only 3 episodes, and the only main characters are Lister, Rimmer, Cat, and Kryten (with a brief cameo by another main character towards the end).
I won't say anything about the plot, because that was half the fun of watching the shows - seeing what would happen, how it would end, and how everything makes sense.
It was weird. I enjoyed it, but it was weird. It's not 'classic Red Dwarf', but it does have moments here and there that are definitely Red Dwarf-esque.