Sorry but you are completely wrong here.
Edit: I’m feeling charitable so here’s one, knock yourself out. https://www.youtube.com/watch?v=maLBGFYl9_o
Instead of arguing about it, maybe consider which way the pressure is pushing during various phases of operation and decide how you would design the thing if the highest forces push outward...
Indeed, picture provided by another poster above shows that is exactly how it works.
And I covered that eventuality in another comment:
> It's possible the stops hook over the corresponding parts in the plug but that's not readily apparent from the drawing at all.