To me it looks like it's 9.99143759666 frames or 9 frames if u count only hole frames
Screenshot:

post replay or wat?

No bro, it's jacker's replay but it's done in 9 frames not 10.

its just because of ghosting
collision only registers on each frame, not every moment that you see when you slow it down. slow motion just eases the transition between frames with inbetweens that are purely visual and have no effect on the gameplay