TEP -
The references to "rub of the green" are introduced in the original quote - which I agree uses the term in a manner not consistent with its definition in the USGA Rules of Golf.
However, with Jones quote, I disagree with your contention that he only means to talk about watering areas in front of the green. The context of the quote is Jones discussion of what he views as over-watering the putting surfaces, resulting in their too soft playing conditions. However, that Jones was very specific in the rest of his article in referring to over-watering, and does not use that term in the quote provided, leads me to conclude that he is refering to something besides watering. The terms he uses - "fairway grass or treatment" suggest something other than or in addition to watering practices. He also refers to areas becoming more "reliable." Bobby Jones was a Harvard educated lawyer, and was very precise in the language he chose to use in his writings. That he could have, but did not, use terms which make specific reference to watering or softness leads me to conclude he has another idea in mind.