This is a valid confirmation.

As it states, you have a "Good signature from Thomas Voegtlin." I can confirm that the key you have for him - 6694 D8DE 7BE8 EE56 31BE D950 2BD5 824B 7F94 70E6 - matches the key I have for him. The reason it tells you "WARNING: This key is not certified with a trusted signature!" is simply because you have not signed ThomasV's key with your own key to tell GPG that you trust it.