Not sure if you are sarcastic or just curious with your question. Perhaps someone with an ocean nearby can try it and share. I don't claim it will or will not work, but I think chances are there are variations that will work in most but the most extreme conditions. What we did was in flat water and if we get a chance we will try it in more choppy waters.
Of course, in rough water you'll have to come off the ski to setup. If you can remount, you should be able to set the tow.
Also, have you tried to hand-paddle the ski while lying on the rear deck? It is way more stable than sitting upright. That's an option when a paddle is lost for example.
Towing in dumping waves is always risky and in surf is plain hazardous. Hence, there are variations in such environments such as towing the "victim" in the water behind the ski, which will place less risk on both parties. Of course, one needs a tow line and I don't think I have seen ski paddlers carry such burdensome items on outings...
I just want to mention, that being towed felt very stable in the water - I was filming with both hands off the paddle and looking sideways while being towed. Also, having the person lying on the rear deck actually stabilizes the ski. It slows it down, of course too...
Sea kayakers do this kind of stuff routinely. If a ski has a bow loop it makes towing almost as easy as in a sea kayak. Without the bow loop/handle, it requires more setup time.