Hey, Steve. Welcome to Permies! You may indeed say "YouTube" here and indeed you are encouraged to embed Youtube videos into your posts when they are relevant. In fact when you are editing there is a "Youtube" button above your text box you can use to make that really easy.
I tried to figure out what video you might be talking about, but Permutter has an
entire Youtube channel so I'm not sure I'm getting it right. It looks like he's a neurologist who thinks eating grain is bad for our brains? (I'm sure that's an oversimplification.) But yes, feel free to embed the video you'd like to discuss!