Since I can’t do the math, my opinion really shouldn’t count for anything, but I do like Verlinde’s perspective here, and I would agree that Dark Matter could be the first strike against Einstein’s Relativity.
Dark Matter only exists, as far as we know, to make some equations work. It always reminds me of the clever ways pre-Copernican fudged their numbers to account for the behavior of heavenly bodies. That we don’t understand gravity as well as we think we do makes more sense to me than that we can’t perceive most of the matter in the universe. Pending a way of perceiving that matter.
I think it would be a mistake for science to not be pursuing both options here.