What type of EASE is this?

Coincidentally, I found a YouTube tutorial recreating the exact same effect (not in English, unfortunately): 

The creator uses a slightly different technique: they turn the layers into 3D layers and animate the position. They also walk through the graph editor for the exact easing curves. Might be a useful reference for you.

Hope that helps!

Thanks,

Nishu

This looks like object movement parented to a null object, which itself is slowly scaling.
The individual layers are keyframed and moving, then stop. But they are parented to another object, which is slowly and steadily scaling down.