I think commercial airframes leak enough that with the ventilation system and a hole that small, there would still be some suction from the outside at 400mph. Think carburetor main jet.
Now, at 150, with a hole big enough for a paratrooper, Bernoulli principal might actually have a small positive pressure, slightly pushing someone back away from the door. Think open house door on a windy day. All theory of course, but your example seems to play that out.
Smaller the hole, higher the airspeed, the more negative pressure. Bigger hole, slower speed at some point starts creating positive pressure.
So if the ventilation system can keep the plane pressurized with only a window blown why did the O2 masks fall and some of the passengers suffer from altitude sickness?