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Everyone nowadays is an "engineer", it's a joke in the US. Even the guy who drives nj transit train is an "engineer" (despite the fact he/she merely opens the doors..). But that's a topic for another day lol
If in fact the tech actually meant unbolt the wheels, spin them 180* and mount them back up, it makes no sense and it's a waste of time. When you go around a corner, the outside wheels will cover more distance and no longer be flipped 180* and eventually they will all line up to the way they were before you flipped them (even if for only a short distance).
As you stated, changing the diff fluid is a band-aid. If it's whining then it already has an issue unless they have an additive that will help.
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1997 Camaro Z28 - 355 LT1, T56, CC503, LTs, ORY, Bald Eagle-back exhaust, !emissions, Lingenfelter CAI, EWP, !CAGS, BMR LCAs, UMI PHB, Koni Str.t/Koni SA, C5 Z06 front / LS1 F-body rear brake swap, factory hurst with short stick 
2014 2LT Cruze 2.0 Turbo Diesel
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