A polygraph exam involves many questions designed to produce a baseline. They ask questions they know you’ll answer truthfully to find out what your vital signs are when you tell the truth and maybe questions that they figure you’ll lie about to see what your vitals are when you lie. So I could see them asking only two questions and calling it a valid polygraph when it really wasn’t, because there was no baseline established.
Especially if the "examiner" is being paid by Fineswine.