I think this rule is aimed at those hoary old aircrew who have been in the same, non-flying related job for 10 years or more and are actively avoiding doing what they are being paid to do. We all know the type; the last aircraft they saw the inside of is no longer in service. That sort of thing.
The majority of ground jobs that aircrew are sent to ARE flying related. If the poster tries to send someone to a second tour, non-flying job, they need a good kicking and told where to go. If you stay in touch with your own career, it is not too difficult to ensure that this does not happen anyway (as I have found over my 27 years in the RAF). Find the job that you want to do and manoeuvre yourself into it! Always have a backup plan for when it turns to ratsh*t though.