you just do it like how i did it.
by editing the template loop-single-reply.php that was in my bbpress folder in my child theme
separate the role from the rest of the bbp_reply_author_link
like this
<?php bbp_reply_author_link( array( 'sep' => '<br />', 'show_role' => false ) ); ?>
<?php
$displayed_user = bbp_get_reply_author_id() ;
$role = bbp_get_user_role( $displayed_user);
if ( bbp_is_user_keymaster($displayed_user) || $role == 'bbp_moderator' ) {
echo bbp_reply_author_link( array( 'show_role' => true, 'type' => 'role' ) );
}
?>
