I know what 'baro aided' means - or I think I do - it's where the vertical navigation part of an approach comes from atmospheric pressure, i.e altimeter.
So extending that with some lateral thinking or perhaps guesswork.
'baro aided outage' must mean some failure of this pressure based method of vertical navigation.
'non baro aided outage' must mean some failure which isn't related to the pressure based method of vertical navigation.
Maybe it means you are shooting a GPS approach, using your altimeter for altitude, and the GPS bit fails. A roundabout way of just saying your GPS horizontal navigation has failed, but you still know your altitude. It is a bit like eats shoots and leaves, confusing.