Not buying it. There was no way bombing was that precise an art in those days. In Cologne, the same could be said of the cathedral. All its windows were blown out, but the building survived pretty much intact. It was NOT because of any intent on the part of the Allied bombers. Their accuracy was notoriously poor in the days when Cologne was being bombed.
And if Ford Werke was producing war machines for the Germans, there is no doubt it was on the hit list. Whether it was hit or not is largely a matter of luck, not conspiracy.
Ironically, this also would have made the plant much easier to target without leveling the entire city, too.
The first Ford vehicle in the "post-war" rolled off the assembly line at Ford-Werke literally hours after the U.S. and Germany formally ended the war. Something about that whole arrangement stunk to high heaven.