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I owned a 2012 Flex and now own a 2016 Ford explorer with AWD, in those vehicles it works out great. In theory it is rear wheel drive, if there is slippage or excessive throttle the front wheels are engaged, apparently not in a on/off mode but some sort of a progressive engagement. They all had the option for fulltime 4 wheel drive, with a twist of the selector switch. I owned a 2013 F-250 4x4 and it had the electronic engagement in place of the lever on the floor, it also had the locking differential.
In my opinion the owner of the unit you are looking at is misinformed as to what he has.
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