Yes, this means that the links can return to Google. From Google's knowledge base:
A successful request lasts only about 90 days. After that, your information can appear on Google search results
Here's how to make the removal permanent:
Make removal permanent
The Remove URLs tool provides only a temporary removal. To remove content or a URL from Google search permanently you must take one or more of the following additional actions:
- Remove or update the actual content from your site (images, pages, directories) and make sure that your web server returns either a 404 (Not Found) or 410 (Gone) HTTP status code. Non-HTML files (like PDFs) should be completely removed from your server. (Learn more about HTTP status codes)
- Block access to the content, for example by requiring a password.
- Indicate that the page should not be indexed using the noindex meta tag. This is less secure than the other methods.
Remove URLs Tool - Google
The easiest and least intrusive thing to do, assuming you want the content to stay up but just not indexed in Google, is to go with the third option - use the
meta noindex tag.