Here in Florida there are service tech that do use parts of the method (but are probably unaware they are doing so). Liquid Chlorine (sodium hypochlorite, bleach) is a common chlorine source here and if the pools are only serviced weekly they will often run a high CYA level (up to 100 ppm) and then just shock the pools weekly (to about 25 ppm) and the FC tend to stay above 8 ppm (which the the minimum recommend FC level for CYA at 100 ppm) until the next weekly service call.
This is similar to the way gas chlorinators run their pools with weekly chlorine gas injections.
Hope this helps.