I have no source at hand but my own autism and being a former fan, but I'm ninety-nine percent sure he's cited them as the originators at least once, in an old Q&A. If I recall correctly, he highlighted dropping the shotgun, since their battlefield role had largely been supplanted by SMGs, then by carbines in the intervening decades. He also mentioned trying to keep most of the physicality in it while trying to appease the range's insurance company, which tracks, given that I think they used to be more physically demanding, before he went full retard.
Or, I could have hallucinated all of this. Who knows?