Thanks for your query.
Well, we did not update the document/ article:
We will evaluate it thoroughly if we could update the document/ article for “POI-XSSF or SXSSF” as well.
Anyways, we did analyze Aspose.Cells Vs POI-HSSF and XSSF a bit and found if a feature is not supported for HSSF, it is also not supported by XSSF as well. The major part of the limitations remain the same whether it is POI’s HSSF or XSSF/SXSSF. As HSSF doesn’t have support for reading or creating Pivot tables. XSSF has limited support for creating Pivot Tables, and very limited read/change support as well. HSSF has limited support for creating or manipulating charts so does it with XSSF/SXSSF.
Hope, this helps a bit.