Is Incfidelibus a Real Latin Word?

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While searching for Incfidelibus, I found conflicting information about its origin. Some websites claim it's an authentic Latin expression, while others explain that it's actually a misspelled version of infidelibus, a recognized Latin word meaning "to or among the unfaithful," depending on context. I'm curious which explanation is correct. If anyone has experience with Latin or historical language studies, I'd appreciate a clear explanation of whether Incfidelibus has any genuine linguistic significance.