this article includes a grey body that the force is acting upon. the difference with the EM drive's method of propulsion is, that while the article you posted

this article includes a grey body that the force is acting upon. the difference with the EM drive's method of propulsion is, that while the article you posted describes a force reacting upon an external, "grey body," as is acceptable with the copenhagen interpretation of quantum mechanics, the EM drive force exhibits a characteristic betrayed by a theoretical pilot wave, which indicates a non-copenhagen interpretation of quantum mechanics, but rather a bohmann version of quantum mechanics, in which the force can act upon itself. run-on sentence alert.