I believe he is talking about a particular Harley-Davidson factory which assembles customized bikes, in contrast to other factories which produce regular Harleys. He just doesn’t know how to say that.
IIRC there’s only one harley davidson plant in teh milwaukee area, and that’s wawatusa. this is an engine only plant and they don’t do final assembly.
a ‘customized bike’ is, by definition NOT a HD.