The winds were very light from the SE so, of course, conditions to the West of the field on approach MAY have been different, but unlikely in my experience of Bali weather conditions for over 30 years living in Bali because, with weather from the SE, that would have passed through here first. And it didn't.
May have been different? You betcha.....My birds eye view from the sands of Kuta Beach told a very different story. The approach area was occupied by an intense cell of heavy rain that had moved through Jimbaran Bay and continued slowly west and out to sea. What was left of it can be seen in the background of the published photos. I do not wish to dispute your expertise, rather I feel your doubt in the existance of any sort of significant weather event further suggests this wasn't just any light sun shower. It was black and it was solid.