I am currently discussing your report with the other staff Fred but bear in mind it's Sunday so it may take a while for it to be actioned.
I would however like to point out clause 4 of the guidelines:
So a callback to an external server isn't in itself cause for the add-on to be removed, as long as that is declared.
In this case I think it does breach the guidelines as it isn't declared in the resource itself, only on the site which is linked to, but as this is a new site policy, I want to get confirmation before removing any more add-ons.