Support for author does not show author column in post table in dashboard

Instead of changing all the columns just add and remove the columns that you want.

add_filter( 'manage_edit-listing_columns', 'et_listing_edit_columns' );
function et_listing_edit_columns( $columns ) {

    $columns['et_listing_type'] = __( 'Type', 'Explorable' );
    $columns['et_listing_location'] = __( 'Location', 'Explorable' );

    // You can remove columns with unset()
    return $columns;
}