No one can prove otherwise. Stats can only be countered by stats.
Having your background in statistics, however, have you ever made one about the modern aircraft with FBW versus fatalities?
As of today, with your statistical argumentation, one FBW aircraft series should be under similar scrutiny, compared to the competitor.
Any number is too big versus 0. That can be just as much "way beyond normal statistical distribution".
To cite you once more, "to suggest this is down to bad piloting in the context of these stats is absurd", would mean that there is something wrong with the one product, wouldn't it?
This is to show that stats can be traitorous!!