It is not uncommon in sports for great players to describe their mechanics in ways that do not match what high speed video shows to be true. My introduction to this was with the great Jack Nicklaus, who wrote an instructional book and within a year was admitting that he was wrong. He said that his play deteriorated when he tried to swing the way he thought he swung. He eventually went back to his original teacher and got straightened out.
Somebody brought up Jenny finch as a case in point. My daughter took pitching lessons from former All-American, Olympian, and NPF player Danielle Henderson. She taught wrist snap-HE. She allowed me to take video of one of her practice sessions as she prepared for the NPF season. She did not pitch what she taught. When I showed her the high-speed video that I had taken and asked her about it she basically said that the video lied and that she did actually pitched the way she taught. She said "It's in there you just can't see it".
Andre Agassi said that on his forehand he rolled his wrist into contact, video shows that he rolls his wrist after contact.
Great players may make good coaches but they rarely make good instructors, there is a big difference between the two.
The Hanson Rule rules, if you can't see it, it's not in there, no matter what some All Star says.
Every single one of his swings, he is down to. His hand articulations are the same. Was his demo exaggerated. Sure.