You are probably correct, with my extra sail area in the conditions you are showing, I would need to be sitting sideways on the tramp (or HAKA's if I had them) with just my feet in the boat trying to keep that AMA out of the water. I have a cheap hiking stick made out of 3/8 PVC water pipe with a simple rope loop on the end that I use when hiking out. If you watch Tom Kirkmans videos of him pushing his Weta (an awesome boat BTW), that's what they do they use their body weight to balance the boat, which also means they have to switch seats on every tack. That's part of the beauty of the AI/TI design with the reef able sail, if you don't feel like getting out of the seat, you don't have to, you can either reef the sail some or relax it a bit and still move along pretty good even with a buried AMA. In my experience though any sudden or unusual force on my AMA's breaks that sheer pin (especially helpers trying to get the boat onto shore). If the nylon sheer pin were to break while underway, complete capsize is pretty much a sure thing. That's why I added a simple stretchy rope to mine so if the sheer bolt were happen to break , the rope prevent the AMA from folding in completely, so you can stop and replace the nylon bolt without having to capsize.
I saw that potential problem the first week I had my boat, it took all of five minutes to rig the rope and clip to the boat, the rope has never been removed from the boat (I just stuff the ropes into the mesh pockets during storage). When setting up it takes all of 2 seconds to clip the rope to the metal cleat on the AMA. The rope does 3 things, first in the event of a nylon pin breakage while underway it prevents the AMA from folding in completely, secondly if you happen to be the unlucky sap that didn't click the AMA braces in completely, the rope prevents the AMA knuckles from coming out of the tubes, and thirdly the rope prevents the AMA's from flopping up and down on their bungys when the AMA's are up in the air (that noise drives me nuts).
I'm not recommending anyone do some of the stuff I have done (most of which I just do to entertain myself looking for something to do). And on a stock AI/TI the likelihood of sheering the AKA sheer bolt is very slim in mild conditions. My purpose of sharing my experiences has only been to show what you can expect to fail on the boat if it is pushed beyond a certain point (valuable information in my opinion), and a few simple tips (fixes) that can hopefully prevent a catastrophe.
I'm not here to argue the point with anyone whether the AKA nylon bolt will sheer or not sheer, or what conditions it may sheer, the result is always the same, the boat capsizes. Adding the simple safety rope fix shown below (first published I think in around 2010-2011), I spotted this potential problem the first week I owned my TI, and came up with this super simple remedy, yet have never seen another TI or AI with a similar simple safety rope setup (though I have seen many more elaborate ones). Based on my own experience, I actually cringe when I watch videos like yours, waiting for inevitable (fold, splash, SOS (LOL)).