The mix is very compressed but unlike Luna Park, that had overbearing guitar from start to finish, the volume of the instruments varies over time. During regular riffs, the guitar often crushes the keyboard. But when Jordan plays a lead, he gets more audible. During my first listen of the stereo mix, I didn't notice any important keyboard parts that were inaudible (as I did on Luna Park).
As far as the orchestra is concerned, Strage Deja Vu is their low point in the mix. They sound a lot better on Illumination Theory and Overture 1928.
It was a deliberate mixing decision to make them inaudible during a large part of Strange Deja Vu (I don't condone it, just want to inform you). It's not representative for the whole concert.