It's a Jive software setting I believe as that option was available on my old personal website I had ages ago, there was a way of overriding it at the ordinary user level, but I can't remember what it was, sorry.
There I defeated the system by clicking Advanced Editor > Html in reply and removing everything but the body and p tags.
However in that instance it was easy as that was all that was there to edit, it would be extremely difficult to single out the right things to delete in an involved response with lots of links.
Another way to fool the system may be by first altering any URL http(s) to hxxp(s) then altering it back using Edit after the post is made. I haven't the time to play around with it I'm afraid.
I'm not sure if this was in the meeting notes, but whenever possible the platform tries to resolve out to a "friendly name." It's not a defect, it's as-designed. As Ex_Brit commented, you can remove the info via the HTML editor.
Regarding SiteAdvisor, I'm not sure. This would probably have to be something we discuss with the product group.