It has absolutely been questioned, the original data comes from Counsilman’s paper from the 80’s where he looked at his swimmers subjective feelings of speed power etc in events and then their training logs prior to it was and always had been conjecture. No control groups nothing. There are actually more recent detraining studies in soccer and rugby athletes that I’ve come across where they go 2-3 weeks with nothing and no significant declines in MSS some showing improvements.
People have taken this chart as written law or truth when in reality Counsilman himself proposed it as a framework, basically a principle of his training plans for a non-locomotor sport. Way overblown!
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