A "file" has some content and one or more hard links to this data, ie. one or more "path+filename". If there is a file with multiple file names, in order to delete the content, you need to delete all hard links,
ie. all file names of it.
You can´t delete the file as in file content directly, you can only delete hard links.
If all links to the content are destroyed, the content itself will be deleted
(at least marked as free space)
Symlinks: Deleting a symlink does not delete the file content
nor the actual hard link which the symlink is pointing to