It's a great synopsis from my point of view. And it's great to see all our relevant projects on a timeline like that (time feels sloshy on the research gallery).
It might be tricky to convey the spirit of the project without experiencing the concrete examples, so it's good that you're including a guided video tour.
Your Hypercard-in-the-World interface with blessing, attaching, etc. is also a good resource because it connects it to Hypercard, which they will be familiar with. It's workings (attaching scripts, webpages in iframes, etc) are concrete from a computerist's perspective. But maybe sending particulars about this would spoil the kinds of ideas you're hoping to get from the meeting.
I wonder if something should be said about your thoughts on scrolling, and how scrolling enables hide-it-under-the-rug complexity. We take scrolling as a given, as the only way we can access digital information. This is especially so with smart phones, where scrolling/panning/swiping is the default gesture. So it might be useful to call it out in particular as a phenomenon imposed on us by screens and something worth rethinking.