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Yes, I know, however it's still tinkering around gravity but in a roundabout way. Add some anomalous mass in order to explain why things appear to be awry with theory. Not so much as playing around with gravity itself but adding bits on in order to have some sort of explanation to account for its observed effects.
A fudge factor is still a fudge factor no matter how you dress it or what you call it
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Uranus didn't conform to its' calculated orbit either. Yet scientists were prepared to add an anomalous mass to the picture and apply Newtonian perturbation theory.
That anomalous mass turned out to being the discovery of Neptune.
The higher velocity curves in the outer regions of galaxies doesn't conclusively prove that Newtonian physics needs to be modified.
Dark matter could be the "Neptune" waiting to be discovered.
Steven