All seems correct to me. My only issues with the article would be:-
(1) A sideslip is a sideslip, dressing it up in different terms because you are using it for different things in my opinion just causes confusion. (In other words, I just don't like the term "forward slip").
(2) Mr Heald has made no mention of the use of rudder as a reserve control in the event of an aileron failure - most aircraft are specifically designed to permit this, and I can think of at-least one case in a light aircraft, and another in an airliner, where the pilot did just that.
G