Not really - it's being applied somewhat perpendicular to the pedals, see for example the red and green arrows in post #212, which point down and back, at the bottom of the circle. So with those vectors, your foot isn't likely to slide off the flat pedal. You may be trying to "scrape mud", but instead you're taking the scraper with you.

I think the weakest part of the circle is around the "10 o'clock" postion where the vector point back at a tangent.Your foot is barely interacting with the pedal here, and in fact the pedal is dragging your foot along. And in post 183, the vectors show no interaction between foot and pedal at the top of the circle- they just happen to be moving in the same direction. When I have switched from cleat to flat pedals, that is where my foot tends to drift off the pedal, for the first day or so until I adapt. Not at "8 o'clock" or "9 o'clock" where you think I'd be pulling up and leaving the pedal behind.