Dave de Vos
Some things cannot be explained in detail by physics. That means that the phenomenon is just too complicated to explain in detail from first principles (in such detail that you would be able to write a computer program that calculates a simulation of the process). This does not mean that the phenomenon is supernatural.
Turbulence is an example from physics itself. Richard Feynman called it "the most important unsolved problem of classical physics". It's still unsolved.
Even though we can't explain it fully, the concept is not useless. We can still use it when describing the flow of gasses and fluids on a more abstract level, like in propellor design or meteorology.
The workings of a living body are also far from being fully understood. It's much less understood than the workings of a star for example. Not because supernatural things are happening, at least I don't think so. It's just that the living body has not yet been researched as exhaustively as astrophysics, because a living body is far more complex than a star.
If it hasn't been researched exhaustively, we don't even know what we don't know.
You're still not answering the question, though. All this might mean something if anyone could provide a concrete example of something in the martial arts that can't be explained by what we know of physics. You make a case here that such a thing could
conceivably exist, but what I'm saying is that it doesn't
, not that it can't