The "next test" would be to look at more galaxies. They did not actually try to apply their theory too many real world observations. The goal of this paper is

The "next test" would be to look at more galaxies. They did not actually try to apply their theory too many real world observations. The goal of this paper is to get funding to try and apply their new theory to a huge number of galactic measurements. Until they do THAT, no one in the physics community is going to listen to them.