Yes, I have tested both sets of code and the are added as attachments direct from their sources.
I have tested the Nextion code along with the Arduino code attached and it definitely follows the potentiometer when you twist it back and forth just like is shown in the Youtube link I posted in my original post.
I have also tested the Halltach code and it reads properly in the Serial Monitor of the IDE. I utilized my function generator to create a 5v squarewave and it reads exactly the same.
I do not know why it doesnt work when I did as you said, but the screen is most definitely not reacting to the changes, it just sits at zero. Unfortunately, I have no idea how to read what, if anything is being sent to the screen while its hooked up.