The chart is based on 4 successive pivot tables (see tabs).
In Excel, it is necessary to click twice on the button “Refresh All” in the tab “Data” of Excel so that all the computations are carried out (apparently excel do not do more than 2 levels of computations at the same execution).
But to my knowledge this is not possible in Aspose …
In attachments, you can find an example of xlsx (in the zip file) and 2 screenshots to compare the desired result in Microsoft Excels and that obtained by Aspose.
Our version of Aspose.Cells is 18.8.0