Hi,
no, using a simple folder link, you can not make Alfresco search for documents within the folder. It is only a symbolic link not a hard link when we use the analogy of file systems. The only way to make the folder contents searchable is by replacing the folder link with a seconday child association to the Folder. Any object in Alfresco can be multi-file and multi-filing works with path based searches.
Regards
Axel