It seems like there are many 'self-appointed' automotive experts on YouTube, unfortunately, most of whom don't seem to know what they are talking about. They are followed by people who seem to know even less.
I was watching one guy, an educator from some training collage somewhere, demonstrating with his fist how a piston ‘rattles’ in a cylinder during ‘pinging’/’detonation’. Absolutely amazing, incorrect & physically impossible. And demonstrated it occurring during the wrong cycle. Commenters were loving it; absolutely bizarre.