I.e., Charles Gould isn't "really" a European. But there is a double
meaning to "really" here, denoting also "materialistically";
i.e., the chief engineer is more of a simple materialst than the idealist Charles
Gould. Indeed, the chief engineer is one of the only characters in Nostromo
without an overmastering dream-ideal; he is associated purely with the physical
conquest of nature.