Who cares whether The Engineer is a pilot or not? For all you know I could be a 12 year old with no physics knowledge beyond 7th grade, and so is he.
What he could show is if he is able to understand and use the scientific method and go beyond discussions on definitions and other word games.
As a pilot, The Engineer must use exact calculations to plot his course and calculate fuel requirements, so he is not unfamiliar with the formulas used for this, so he could tell us all whether those formulas imply a flat earth or a spherical one, but that would spoil the fun for him.