Audio of the plane and ATC shows they were indeed going for the Rwy 20 approach - circle to rwy 11.
Conditions at the time were pretty marginal for circle-to-land, smoke, storms in the area:
METARs at approx. time (2018Z) of crash:
KTRK 262050Z AUTO 28011G16KT 04SM BKN023 33/08 A3013 FU RMK VIS 3 1/2/V5 FU BKN023 ACFT MSHP
KTRK 261945Z AUTO 09005KT 04SM BKN023 32/06 A3014 FU RMK VIS 3 1/2/V5 FU BKN023