That the odour was described as fuel rather than AVGAS might suggest that the investigators don't consider it relevant at this stage, remembering that this is just a preliminary report. What caught my eye was that the aircraft impacted inverted which is a strong indicator of disorientation.
It didn't take long for the media to join the dots.
Father demands aviation regulator CASA 'get off its butt' after second fatal Angel Flight crash - ABC News (Australian Broadcasting Corporation)