No. A working internet connection should suffice if the library is reachable from an external network.

Imagine you were using a Tabular server instead of PowerPivot with a total size of 25 Gigabyte. That would be quite some PowerPoint presentation 🙂

Packaging the data within PowerPoint would blow up the size and would need it's own SSAS database integrated.

edit: I can imagine one of the reasons for this is also because Power View export to PowerPoint is a SharePoint-only feature.