This is my personal opinion and preference so just keep that in mind.
What I prefer is for the lady to take her position and then for me to cup my hand over the ladys left shoulder. So I feel like I am applying small pressure on the lady but not the other way around. The reason I prefer that is that if you tell the lady to lean into your arm and your arm is too far back for the ladys stance then she will be off balance as she moves.
That said, maybe this particular lady was leaning forward into the man and not laying out but its hard to tell just off of a post. I would be careful of the word pushing but again its my preference. Depends on how much pressure and how the push is created. I think the bottom line is that the man needs to connect to the ladys shoulder blade and the lady needs to connect to the gentlemans body. Along side all the other points of contact of course.

Simeon