Let's be honest here, the Physics of flight is standard stuff, especially in a vacuum. Coding the flight model to feel good to the player is hard though.
But here's the thing, almost none of the ships in Star Citizen are really designed to fly in space, or even in atmosphere. They're designed to look good, with almost no consideration for function. And if you're going to the trouble to calculate the performance based on thruster position and power then this matters. So clearly, despite all the physics in that document, they still just have a flight model similar to the Wind Commander games.