ลงประกาศซื้อขายฟรี

While searching for Incfidelibus (https://www.internetincharge.com/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.