I would imagine you would add what @baris mentioned in here:
if user is member of the poster set, return content as is
@julian does this plugin make the seo process better then what it is ?
Redirect search queries to Google.
Installed 1.0.3 | Latest 1.0.3
For more information: https://github.com/revir/nodebb-plugin-google-search2#readme
No, that's not what his plugin does. It just redirects searches in your NodeBB to Google.