An update,
My mechanic and I cleaned the throttle body, intake tube and the T pipe, there were only a little bit of oil in them, not enough to cause MAF malfunction, we didn't think. We also decided to replace the AOS anyway since its not too expensive. We then reconnected the existing MAF and the symptoms (rough idling, hesitation when revving, etc) were still there. But as soon as its disconnected, all is smooth again.
Good news my replacement MAF has arrived from ********************************AZ, thanks to their excellent customer service (US to AU in less than a week)!
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