The GPS track of the yacht was exported almost 3 months after being recorded (when the skipper wrote up the journey for a blog). The track would have been recorded in UTC but the skipper exported it in local time of the location where he wrote the blog. I think he was only interested in the track for the purposes of plotting a map and at the time didn't care about timestamps.
He doesn't seem to be talking online about the incident (in my view probably quite wise) and his wife is so bad at communicating facts that probably only a forensic analysis of the recorded data files would reveal the truth.
But in any case what's the point? She only filed a report after armchair experts elsewhere noticed that the yacht had been close to the estimated aircraft track. Up until then she hadn't connected the two events. It was dawn, she saw strange colours and that time of day always creates unusual lighting effects in the sky).
Had she kept a diary and filed a report sooner it may have helped the ATSB with it's construction of an estimated flight path. As it is her story, even if true, adds absolutely nothing to the investigation.