Hi Axel,
Here is a future proof way to do it

/**
 * Reorder status in the dropdown.
 *
 * @param array $statuses statuses.
 *
 * @return array
 */
function mpp_custom_status_order( $statuses ) {
    // the ordered list, knowm.
	$ordered_statuses = array( 'public', 'loggedin', 'friendsonly', 'loggedin', 'private' );

	// we will organize the list here.
	$new_ordered_statuses = array();

	// Copy all valid status based on the ordered status. It only copies the statues specified by the ordered list.
	foreach ( $ordered_statuses as $ordered_status ) {
		if ( isset( $statuses[ $ordered_status ] ) ) {
			$new_ordered_statuses[ $ordered_status ] = $statuses[ $ordered_status ];
		}
	}

	// now, some other values might still be remaining.
	$remaining_statues = array_diff( array_keys( $statuses ), $ordered_statuses );

	foreach ( $remaining_statues as $remaining_key ) {
		$new_ordered_statuses[ $remaining_key ] = $statuses[ $remaining_key ];
	}

	return $new_ordered_statuses;
}

add_filter( 'mpp_get_editable_statuses', 'mpp_custom_status_order' );

It might be even easier in future when we add the support for Sortable interface.

Regards
Brajesh

Thank you for confirming.