This is just the usual bullshit. Einstein was an asshole who ripped off some 18. century math and took the credit for it and by doing so gave the final deathblow to the use of Maxwell's original 20 equations which actually did provide the math you need to understand dark matter long before Einstein even was born.
When you drive a car around a corner and feel your body being pushed to the side, that's you pushing against dark matter. It's as simple as that, but the strategic advantage which this knowledge provides, renders it cosmic top secret (pun intended :)