Such papers only prove that the simplest formula proposed for MOND may be too simple.
While it matches well many experimental facts, there also other experimental facts that appear to contradict it.
There is an essential difference between a MOND-like theory and a dark matter based theory.
For a MOND-like theory one has to choose some mathematical relationship that determines the gravitational forces, given the observed distribution of matter in the Universe. Then one must compute the expected movements and compare them with the observed movements, to verify or falsify the postulated mathematical model.
On the other hand, any theory based on dark matter does not have any predictive power or any usefulness. Because the observed movements of the bodies in the Universe cannot be explained by the conventional mathematical model, one adds arbitrarily dark matter wherever it is necessary to remove the discrepancies in the observed movements.
When one is free to add dark matter, then all mathematical models for gravitation become equivalent and none can be used to predict what we observe.
Unless an alternative method for observing dark matter would be discovered, using it is just an euphemism for avoiding to recognize that the current model of gravitation is not accurate enough.
While it matches well many experimental facts, there also other experimental facts that appear to contradict it.
There is an essential difference between a MOND-like theory and a dark matter based theory.
For a MOND-like theory one has to choose some mathematical relationship that determines the gravitational forces, given the observed distribution of matter in the Universe. Then one must compute the expected movements and compare them with the observed movements, to verify or falsify the postulated mathematical model.
On the other hand, any theory based on dark matter does not have any predictive power or any usefulness. Because the observed movements of the bodies in the Universe cannot be explained by the conventional mathematical model, one adds arbitrarily dark matter wherever it is necessary to remove the discrepancies in the observed movements.
When one is free to add dark matter, then all mathematical models for gravitation become equivalent and none can be used to predict what we observe.
Unless an alternative method for observing dark matter would be discovered, using it is just an euphemism for avoiding to recognize that the current model of gravitation is not accurate enough.