I'm sure that you don't really care, but I do agree with you regarding the refrences to right-thrust and torque --- but --- I have visually seen the spiral airflow off propeller tips -- it can be quite visible in humid conditions, and I'm not close to being alone in this observation. It has even been photographed.
But, if you will look very carefully the vortex rings off the prop tips go in the opposite direction that the slipstream theory predicts.
Another strike against the slipstream wrap theory that the classic hits the tail from the left causing more lift on the right theory contradicts all other foms of airfoil/ airflow theories. It spirals the wrong way.
And no I don't feel better.