The question has been asked before - If the toggle switch is OFF, does the RNS252 continue to process data in the background (i.e. "OFF" is a "stand-by" mode)? From answers received, it merely switches off the display.
Switching it "OFF" was a recognised method of solving EMC problems, of which there were many in this immature aircraft.
The person who wrote "appears to be working perfectly" clearly did not read the Trimble 8000 GPS report, which listed both faults and defects in that system.
And MoD completely ignored the fact the systems were not cleared for use.
Simply highlights what was said earlier. There are contradictions in the reports, which MoD did not seek to reconcile because to do so would draw attention to their dissembling.