If google managed to index them before the deletion and someone stumbles to that page while searching for something on google, the link will point to a 404 page. Moving them to the archive is better because links remain tha same (Thanks to the Google SEO plugin);
Links to that thread inside the forum will point to a 404 also.
If our domain has too many 404 Errors floating around in the search engines rankings may suffer. That's why I prefer moving threads to archive instead of deleting.
We've created some simple and basics guidelines for the "News Section" Forum
"News Section" Guidelines
The topic title should be the same title as the original news report. Some editorial leeway is allowed, of course, if the original title is too long, inappropriate for ATS, inflammatory, etc.
The submission must contain a permanent, valid, and direct link. Links that take the reader to the main page of the source site but not the article itself are not permitted.
Please do not make personal commentary within the original post. Any personal commentary should be made in subsequent replies to the original post.
After providing a snippet from the news source, you should make a new reply to add your own spin or opinions on the topic. We want to know what you think. Do not simply copy and paste more from the article or leave a commentary post that boils down to, 'This is crazy! So what does everyone think?'. Add your own thoughts and information in order to facilitate discussion to your thread.