I'm not sure where the reporter got the thing about the 220s and 440s. The group that Ron trained with was doing a sort of Zatopek imitation before he started running with them, i.e., lots of 440s but fairly slow and with short, fast recoveries. Eventually, by the time Ron joined them, this had evolved into a steady distance run where everyone started easily and ran together but accelerated during the run and guys would drop off the pack until maybe only Ron was at the front. This was all done at a horse race track. He also used to meet up with Derek Clayton once a week, maybe twice if he wasn't racing, and do a really hard 18 mile run on the roads.
There was a stretch of time when Lydiard was after Ron to do some peaking by doing some shorter, faster rep work. Maybe that's where the report came from. When I was discussing all this with him he was very clear that nearly all of what he did was steady runs at a good clip, a long group run on Sundays and generally a weekly race. The other thing to remember is that Ron and his group were just guys who ran and kind of made it up as they went along. There really was no master plan so they probably had times when they tried something different. There could well have been a stretch when they decided to so some more rep work than usual.
Another possibility is that someone knew something about Ron's early training with Stampfl and included it in the description. That would have been almost nothing but 220s and 440s.