OK, It had nothing to do with Renault making Argus engines, The French building Bf 108s, the Siebel 204 being built in Czechoslovakia and France. BMW 801s (or parts for them) being built in France. Do 24s being built in Holland and France. The He 274 being built in France. and others.
German workers traveled to France and Holland and Czechoslovakia on their vacations, bringing their tools with them and working outdoors (no factory floor space) in a late "strength through Joy" program I suppose?
What ever happened to those "dispersed" manufacturing schemes that the allied bombing was supposed to have disrupted? If you are bringing in parts from other locations to assemble in the original factory you have increased factory floor space. You just aren't counting the off site floor space.