SystemGestureDeferMode - Does TopEdge follow physical device rotation?

I think the docs might be slightly incomplete. Referring to here:

https://docs.unity3d.com/ScriptReference/iOS.SystemGestureDeferMode.html

Does the TopEdge mean the top of the device as it rotates? So if I were to turn the phone upside down, the physical bottom of the device would become the TopEdge? Or no?

I don't have an iPhone X otherwise I would test myself.