A Did Einstein not believe that general relativity geometries

I have read this paper http://www.sciencedirect.com/science/article/pii/S1355219813000695 that the author try to said that einstein not believe that gravity is not cause the space time curvature. I want to know that this is true or not. Because when I have read about general relativity I always found that space time curvature was einstein idea.
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Edit: This is a question about history, not physics, and is off topic in the physics forums. The thread will remain closed.
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