I just re-watched a few laps of qualifying to see if I could quickly spot it. Most people are on the arch of the outside foot, heel dug into frame. Ball of the inside foot. At full lean.
Oliveira seems to be more on his heel then arch on the outside foot, and I think that was throwing me off. His foot sticks like straight up in the air, perpendicular with the bike.
Don't want to re-watch anymore, but next race week I'll see if I can spot it.