Okay, two things here... both of which are so obvious I'm ashamed to have to point them out.
1) No, the AK and AR are not similar in this area. The geometry, function and construction are all completely different. A high grip on the AK magazine places the hand towards the rear of the ejection port, which means at most you are going to get a painful thump from the bolt handle. A high grip on the AR-15 magwell places the hand at the front of the ejection port, blocking the opening of the dust cover and the ejection of a casing. Also different are the angles between the AKs magazine and body and the AR-15s magwell, where the AK makes it less likely for the hand to creep high on the receiver because of the acute angle in which the magazine meets the receiver. Contrary to the AR-15 on which the D-ring and the forward takedown pin housing naturally lend to "choking up" on the gun.
It really shouldn't be that hard to understand how and why this happens. Just look at the second picture I posted. Tell me where that guys thumb would be if it were on the other side of the receiver.
2) Finding a guy looking super cool and ninja running one type of gun without malfunction means absolutely zero to refute that another person running a completely different type of gun can't induce a malfunction. You might as well have posted a video of the Stig setting lap times for as much relevance as it has.