If it has emptied the coolant expansion bottle, then yes - bad sh!tz brovver!

Do NOT open the cap whilst the engine is warm though - wait till it is stone cold - and ONLY top up with the genuine Volkswagen G12++ coolant (mix it with water at 50:50). Check it every morning when the engine is cold, and if it completely empties the expansion bottle again, a trip to the stealers is needed.