Is it small or just far away ?

This paper is a response to a paper about another paper. There's this galaxy which appears to be lacking dark matter, but then someone came along and said, "Oh no it isn't ! It's just a little galaxy that's closer than you think !". And they gave a bunch of independent evidence demonstrating that the distance had been miscalculated, and showed that at the closer distance from new measurements made the galaxy entirely normal instead of being a crazy-weird inexplicably baffling thing.

This new paper is the predictable, "Oh yes it is !" response from the original team. It's just a letter, so it's short and doesn't go in to a blow-by-blow response to the previous work. Rather they focus on one distance measurement and claim that the doubters were wrong : they try and show that their techniques give results in good agreement with measurements of other galaxies, and that the other team had a methodological flaw. They show that their distance measurement gives very similar results for all the nearby galaxies in this region, so that as expected they're all in a group, but a distinctly different, higher distance for this supposedly weird galaxy.

Who's right ? I dunno, I'm nowhere near qualified enough to judge - I've never used these methods. It's worth remembering that observational data doesn't always have the final word. If observations are uncertain but indicate a really weird result, it's good practise to go back and check - usually, really weird results disappear with better data, bringing everything back into line with conventional expectations. But not always. Watch this space, I bet you anything you like the "oh no it isn't !" team will soon respond to the response...
https://arxiv.org/abs/1807.06025