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Yes, indeed it does. I took Butch's course from Butch, it was most worthwhile (and entertaining).The tether idea comes from public service diving.
Consider the level of training that most PSD ice responders have. His course is intended to be overly cautions as 'Job 1' for every responder is to go home at the end of the day. Recreational ice diving is entirely another animal (from the standpoint of training). We pick the time and conditions and get to call the dive if things don't suit us, not so for PSD's.
I would argue that a course that made the recreational ice diver more aware of hazards and better able to deal with them would be worthwhile in the recreational world. I would also contend that going untethered is far too big a jump from any initial ice diving course.