A recently issued CASA AWB recommending control cable retirement at 15 yrs may be where your friend got that from. I believe the SID only calls up removal and thorough inspection of control cables.
Also I think most LAMES wouldn't have an issue with signing out re-start Cessnas as the factory corrosion protection in the form of pre-priming everything before assembly will mean that the kind of corrosion issues seen in the older models will probably never eventuate.