If i am correct then we are using different terms for the same thing
Here
New URL and Destination URL are the same

Here
Source URL and Destination URL refers to Expired URL and New URL in the manager screen

Have I got that right? If so then we need to be consistent and just use one term for the same thing
Also source URL and expired URL are the same thing
Also source URL and expired URL are the same thing
Yes that's right, we have always used source URL and destination URL but that is a little confusing. I suggest we us:
Expired URL:
New URL:
Since it has to be a 404 to redirect.
Can you send a PR for that change than?
Sure will do
PR sent: #13090
Closed as we have a pr