Taken from this discussion:
For TWL users to access Newspapers.com, the library sends them through a proxied domain at https://www-newspapers-com.wikipedialibrary.idm.oclc.org/. This often results in this domain name making its way into the mainspace, which is problematic because it can only be accessed by those with access to TWL.
One example with an edit that used the proxy link, then was manually fixed:
https://www-newspapers-com.wikipedialibrary.idm.oclc.org/article/the-baltimore-sun/137543642/ --> https://newspapers.com/article/the-baltimore-sun/137543642/
the first link redirects to TWL's home page while the second links to the article.