Pre-Adamites: The inhabitants of the Land of Nod?

"Qayin later settled among some of these other people in the land of Nod, where he found a woman to be his wife (Gen 4:16–17)."
https://www.plonialmonimormon.com/2014/01/pre-adamites-in-bible.html

"You have the Adamic race and you have the pre-Adamites. That means there were people on the earth before Adam. The pre-Adamites is the us out of which Adam came, and they are called aboriginal. There were pre-Adamites on the earth before Adam. If Adam was only one person, Eve was one person, Cain was one person, Abel was one person, and, Cain slew Abel, then, Cain goes into the land of Nod and he finds himself a woman in the land of Nod, then, where did she come from? What family was she a part of?"
https://www.finalcall.com/columns/mlf/mlf_adam07-03-2001.htm

"The explanation is given for Cain’s wife and his journey to the land of Nod and the city that was built. Why would Cain build a city if there were no Pre-Adamites? Where did he get a wife if his parents were the first people?"
https://brotherhoodofthewhitetemple.com/product/adam-and-the-pre-adamites/

"The concept of a pre-Adamic race is the idea that God created a race of humans who lived on the Earth before He created Adam, the first man. This hypothesis has been promoted by various scholars at various times throughout history."
https://www.gotquestions.org/pre-Adamic-race.html