Was that sarcasm? Otherwise there's no need to suppose anything as fuel contamination was also mentioned as a possible cause.
"Mover 35, Houston Center, turn heading 280 for noise abatement."Of course, Center would never say that, it's intentionally misleading, but then you wouldn't have the joke...
"Center, Mover 35, I'm at FL310, don't think they can hear us down there."
"Mover 35, ever heard a KC-10 run into 777?"