How to output a permanently delete comment link?

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After briefly testing, the code snippet from OP seems to work:

printf(
    '<a href="https://wordpress.stackexchange.com/questions/269898/%s">%s</a>',
    wp_nonce_url(
        admin_url( "comment.php?c=$comment_id&action=deletecomment" ),
        'delete-comment_' . $comment_id
    ),
    esc_html__( 'Delete comment', 'text-domain' )
);

But it looks like we have to make sure that the author is only deleting comments on hir own post, otherwise it will look for the edit_others_posts and edit_published_posts primitive capabilities.

The edit_comment is not a primitive capability, so instead we have to look at the map_meta_cap() function to see what primitive capabilities it relies on. There we can see that edit_comment is a meta capability that uses:

$caps = map_meta_cap( 'edit_post', $user_id, $post->ID );

for non-orphaned comments. Then we have to look at the part where the edit_post meta capability maps to other primitive capabilities. There are few possible mappings there, e.g. to edit_others_posts and edit_published_posts primitive capabilities.

Jean Galea has written a great article on roles and capabilities, where it says:

  • Primitive capabilities are assigned to user roles.
  • Meta capabilities never should be assigned to a role.

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