The author is 50% correct. As John Wheeler stated "Spacetime tells matter how to move; matter tells spacetime how to curve." The author is unfortunately forget

The author is 50% correct. As John Wheeler stated "Spacetime tells matter how to move; matter tells spacetime how to curve." The author is unfortunately forgetting the second part. If matter is quantized spacetime curvature must also be quantized, because matter defines our spacetime. In principle one can even shorten the sentence and say: matter tells matter how to move. Spacetime appears only to be a convenient calculation tool. And in that sense spacetime=gravity isn't a force. It actually doesn't even exist.