From the nodes' description: "Retrieve the object that contains the geometry nodes modifier currently being executed". This was discussed in the most recent geometry nodes module meeting. Because the node allows you to retrieve the position of the modifier object, it has to add a depsgraph relation to object transform. Expect that modifiers will be reevaluated when moving the object. In the future, better static analysis of node trees could make this check smarter. Differential Revision: https://developer.blender.org/D16037