I've watched all the Masters of Horror episodes and no, it's not true and silly to suggest... But I did LOL at the "washingtonians." It was a pretty good story. Dario Argento's Jenifer was my favorite in the series.
How do you know it was not true? The vast majority of so called american history IS A LIE or has been distorted to make it palatable to certain ones. Much that has been claimed NOT TRUE in america has turned out to be true. MK Ultra, DARPA, NSA, D.U.M.B.S, War Reasons, Project Montauk, Blue Book, FBI, CIA etc etc etc.. people were ridiculed to hysteria for even suggesting these agencies/things existed in their time, before they finally became publicly known. With former presidents like Washington being tied to the OCCULT, Freemasonry, Luciferian and Satanic worship IT IS HIGHLY POSSIBLE that he/they were into cannibalism as the belief that having sex with a certain person, or drinking their blood or killing a person in a ritualistic way will EMPOWER them from the dark side.