I hope the attachments come through for the layout of the graph.
For "my version" I had a TN for the title on the page before the graph. The proofreader version includes the title with the graph, forcing a label on line 24. Does this version violate Nemeth Formats Rule XXV 185a for a spatial?
My recommendation would be to put the title with the graph. Because the title of the graphic is a part of the graphic...they should always stay together. This is more important than whether or not you have text on line 25. The TG Guidelines do not state that you cannot have text on line 25. It only states that there must be at least 3 blank cells between the text and the page number and you easily have that with the text included on line 25 of your example. In this situation I would agree with your proofreader's suggestion. Great question!!!