Deleted all code from Blog CMS page but can't delete collection

I have a pre-populated blog CMS page from a Webflow theme. We deleted all of the template code from the dynamic blog, without unlinking it from the dummy blog posts.
Now when we try to select all of the dummy blog posts in the collection and delete, it gives us an error “we couldn’t delete these items as they still referenced in the blog posts collection” However the blog posts have been completely deleted, so what/how do we get around this?

Here is my public share link:

The error is actually referring to these references, within the same collection-

If you clear those out like this, and re-save on each record, you won’t have any references blocking your delete.

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Thank you very kindly!