it will be explained precisely why it cannot be overturned by recourse to a hypothesis for which there is no evidence and which is revealed as wholly implausible when tested against the known facts."
I wonder to what hypothesis they are referring? As far as I'm aware, the campaign has not officially propounded any alternative hypothesis. As the "known facts" do not amount to a hill of beans, the only hypotheses I can imagine being rendered "
wholly implausible" by said sparse "known facts" would be some of Walter Kennedy's more exotic Tin Foil Hattery.
Of course, it is the absolute acme of plausibility that the highly experienced and highly qualified aircrew just took the notion to fly themselves, their aircraft and their passengers into Beinn na Lice.