Whether or not something "is" a 1911 is somewhat flexible. For example, Imbel (the Brazilian company that, until a few years ago, made all of Springfield Armory's 1911 pistols) has for sale in Brazil a CCO-sized "1911" (Commander-length slide on an Officers ACP-size frame) that's chambered in .380 ACP and has a fixed barrel. No link-down -- it operates on direct blow-back, just like these little Browning .380s.
I still consider the Imbels to be 1911s.
Para-Ordnance made their double-action only LDA pistols. They certainly looked like 1911s (except for the trigger). The action was totally different from the Brpwning-designed 1911 action, but I'm still willing to consider my LDA to be a 1911.
And then there's the Coonan ...