No, actually calling it missing mass is dark matter. MOND would be another explanation, and there's no reason to conclude it's unworkable.
https://en.wikipedia.org/wiki/Modified_Newtonian_dynamics#Re...
From Galactic Bars to the Hubble Tension: Weighing Up the Astrophysical Evidence for Milgromian Gravity, https://www.mdpi.com/2073-8994/14/7/1331/htm
No, actually calling it missing mass is dark matter. MOND would be another explanation, and there's no reason to conclude it's unworkable.