I don't actually know whether this is the expected behavior or not, but it is confusing.
I have an Article Scoped program tracking Wikidata items (GLAM institutions) via a PSID → https://outreachdashboard.wmflabs.org/courses/Wikimedia_Sverige/Test_Wikidata_program/home
On the Articles tab, only the tracked GLAM items are shown, as expected. However, when I export the stats in CSV, all edits/articles made by the participants are included, not only the tracked ones (basically the same as the Activity tab).
The best way to see it is in the Articles export for this course, which contains a large number of Lexeme items, which are definitely not tracked.
If this is how the export is supposed to work, it would be useful to include a column to keep track of whether the item was within the scope or not.