This recent paper in Nature (also see here$^1$) claimed to have discovered a galaxy without dark matter. However, in the Standard paradigm of cosmology dark matter played a crucial role in the formation of galaxies. What does this discovery, say about the nature and existence of dark matter? Does it rule out how we explain the galaxy rotation curves?
$^1$The video link that I've cited says that this lack of dark matter in a galaxy strengthens the existence of dark matter though I don't understand why.