I am not sure if there were recent changes to the pages, but:
I don’t see an instance of the phrase “We suggest submitting links with a short description.” on the “About” page.
The “About” page links to the new users guide which is probably what you were looking for, even if that’s not quite a charter. Apologies if you already read it.
Granted I see no clear indication on that page that debates are welcome in the comments of all posts (and indeed I think there are some rare exceptions). But it does list a few things about “conversations” on the site, for example “we try to focus on what would change our minds”.
I am not sure if there were recent changes to the pages, but:
I don’t see an instance of the phrase “We suggest submitting links with a short description.” on the “About” page.
The “About” page links to the new users guide which is probably what you were looking for, even if that’s not quite a charter. Apologies if you already read it.
Granted I see no clear indication on that page that debates are welcome in the comments of all posts (and indeed I think there are some rare exceptions). But it does list a few things about “conversations” on the site, for example “we try to focus on what would change our minds”.