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I've never heard of aluminum being galvanized either, see below, might explain what they were referring too. I recall from working in the metal & glass curtain wall and window business, that at minimum, for those aluminum extrusion framed components, mill finish areas of the aluminum was anodized, which affords it some protection. Alumuninum can and will corrode, but not like ferrous metal, bond 2 dissimilar metals together ( from the galvanic series ) Alum + Copper, you will get oxidation and other reactions. One thing inherent to a design with these systems is using a bond breaker, many times our connections would be made of mild steel, primed with red oxide primer, directly against the anodized aluminum, and in a dry environment is ok, but I've had to convince consultants on the job that anodized finish does provide an element of protection, had the factory not anodized the mill finish areas, it oculd have been a costly mistake if the work was rejected. Many times a plastic shim or other material was used to seperate 2 dissimilar metals by providing a bond break. Aluminum is often painted, Kynar, and the PPG Duranar which is a real high end finish, unique application but supposed to be highly durable + many other finish systems. There is such a thing as Galvalume, and that is used for roofing panels, take a look at the USS Steel link, some information on that, probably what Alex was referring to, can't think of anything else that it would be, like you said it don't make sense.
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