// Change author url of course
function wbcom_filter_course_author_url( $url ) {
    global $post;
    return bp_core_get_user_domain( get_the_author_meta( 'ID', $post->post_author ) );
}
add_filter( 'lm_filter_course_author_url', 'wbcom_filter_course_author_url', 10 );