Belgique, for what it's worth
The inertial forces refer to the acceleration necessary to maintain the motion irrespective of atmosphere. The forces necessary to shift air out of the way are additional. However, I am sceptical also, these are huge implied forces. You would need all the inertias and the aero coefficients to do it properly. No doubt someone with the model and the computer will do it. Can't see how it's consistent with the preliminary findings though.