Yes, it is related to this thread. Issue is if we use kite shape and adding text to this shape, the text will overflow. Text frame of this shape is base on rectangle. Not on kite points. If you work on previous version of power point you can see this directly adding text in kite shape. It will overflow from kite points.
Now Microsoft corrected this issue in latest release. If you add text in text frame of this kite shape, the kite will scale without affecting its end points.
Also you can provide additional option in Aspose to get and set end points through coding. So whoever is need to make any change, can do.