I agree. However, the people that are paying for this mission still use imperial units. Those of them that are paying the most attention would probably agree with us though.
US customary units are not imperial units. Many people don't realize, for instance, that MPG is not comparable between the US and the UK because gallons are substantially different.
Why? It's the same information.
I don't think they use imperial units.
Why? What difference does it make? It's just a unit. It makes exactly 0 difference.