I don't agree with the "twice". A frequently performed manipulation like the fuel cutoff (usually performed after landing) collapses down to a single intention that is carried out by muscle memory, not two consciously selected actions.
His statement was about a certain, obviously real tendency in general, existence of which is reasonable to assume there is enough research about.
He objected not to the unlikelihood of an accidental manipulation, but to the potential flaw in your comparison (which was at best a valid opinion).
https://www.google.com/search?q=%22Your+opinion+is+valid+but...
I think you're misarticulating my argument.