JTO
You raise some interesting points.
In the interest of Flight Safety we now all realise the dangers in having loose articles in the cockpit and what happens when they interfere with the controls. Flt Lt Townsend has acknowledged his part in the event, he has pleaded guilty to " negligently performing a duty by allowing his camera to become wedged behind the stick."
The more problematic is the subsequent reporting of the event, which is pertinent to the Just Culture (which is often misunderstood to be no-blame.) If, as you conjecture, the principle evidence to support the charges of perjury was incorrectly gathered and presented then it ought not to be considered. I am not confident that this was presented at the court martial. If your opinions are valid, then in the interests of justice and a just culture the court martial verdict, whatever it is, should be invalid and this may be shown in an appeal (is there such a thing in a CM and is it available to both sides?)
Of course the verdicts have validity in law, but that is not always coincident with justice.