If you note carefully, the slides switch from being about "Let's use Sage" to "Let's use Sage++" between Demos 5 and 6, which would validate John's suspicion. In a slightly older version than Jason's I have neither MacDonald nor Jack Polynomials, and of course not Poset, and apparently not "@manipulate" (as opposed to "@interact"). In Demo 9 he returns to regular Sage.
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