Mason worked for Ilford Dan and repudiated this method in his book because it built up a constant amount of hypo and silver salts in each wash, whereas the running water method had effectively zero hypo and silver at the surface of the film as long as the wash continued. He then went on to show it with the math which, as I say, I posted before along with his thoughts.
The rinse and dump method was to be used only in cases where water was limited, and actually Ilford had him design it during a drought in England / Europe, some 30 years ago. It can easly be proven wrong just by thought experiments, then the math and then the acutual analysis which he has done.
Please read the book I referenced in previous posts.