 While the basic thought is clear enough, one might worry about the details of this argument. In relativity theory, there are no such things as times or spatial locations, at the fundamental level. So it would be at least misleading to say that according to relativity theory, anything that is located at times is located at spatial locations. But a defender of the argument probably has in mind precisely this implication of (special) relativity, that spatiotemporal regions are fundamental, because there is no unique decomposition of spacetime into space at times. Presumably the lesson of relativity theory for the present debate can be suitably reformulated.