what are the chances that windshear may have been involved
Weather conditions that afternoon seem to have been prone to windshear.
However, the METAR does not show any TSRA until about 1200Z. At 1200Z there are CBs overhead, according to the METAR.
Accident time according to media reports was about 1500-1530 LT, which translates to 1030-1100Z.
Although the 1027Z METAR does report peak winds from 060 degrees at 26 knots at 1005Z and wind shift at 1027Z.