Somehow it doesn't seem to me that he's pushing really hard. True it's weird some line he's taking. Weird because that guy raced in LMP2 I think with good results, he's not a bad driver at all.
About the track. Potrero de los funes is a lake in San Luis, there's a semipermanent circuit that goes around the lake. It's public roadway everyday. So no, that's not his personal track.
His personal track, locate it with google earth:
S 34º22’26″ – W 58º48’19″
It has some tunnel and bridges too. The big building is his car collection personal and private museum.
Excuse the OT.