which means: "Attention: this key is not certified with trust signature"
It appears you have the right files because they are signed by the correct key (
6694D8DE7BE8EE5631BED9502BD5824B7F9470E6,) but you have not
certified ThomasV's key. Certifying the key essentially tells gnupg that you trust the key and the owner.
To sign ThomasV's use the following code:
gpg --sign-key 6694D8DE7BE8EE5631BED9502BD5824B7F9470E6
Or:
gpg --lsign-key 6694D8DE7BE8EE5631BED9502BD5824B7F9470E6