Oggers,
What is about "1 part in 100,000" that suggest it matters?
Drag changes by 1 part in 50,000 would have the same effect. How much is that? It's associated with the same density changes as climbing about 10cm. QED.
Perhaps Dr Greaves should worry about density changes from the top to the bottom of the wreckage too? I don't think so, and I assume that in fact Dr Greaves meant something else in his abstract.