This seems pretty clear to me:
Also known as “serverless”, “client-side”, or “static” web apps, unhosted web apps do not send your user data to their server. Either you connect your own server at runtime, or your data stays within the browser.
Personally, I don’t remember having had a conversation with anyone who disagreed with that definition. Also, you are the author of that definition, so it would be even harder to disagree with your opinion on it. 
My question would be more about how to fit it in to the current structure of the website. There’s already a page about tools for unhosted apps for example:
There’s also one about per-user (storage) back-ends:
Are there any plans to update those pages to include Solid, and to fit the tutorial link in a place, where it’s part of the published Unhosted story?