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In Enter MacBeth, MacBeth refers to Demona as the Gargoyles' queen. But wouldn't she or even someone of her clan from the past have told him a bit about Gargoyles and their clans and that they didn't have kings or queens? Or did she leave him to believe she was their queen?
I think you're taking his statement too literally. He saw her as the leader of the gargoyles, which she was during the key moment of his natural life. He views leaders in terms of kings and queens, so used that language. (Also as a chess metaphor, I seem to recall.) But he wasn't speaking or thinking about her this way literally.