How do I know? Because when I look at the names of the Urartian Kings, most look very familiarily-Armenian. Aramu(Aram), Menua, Arghisti. 

Argishti I (Armenian: Արգիշտի Ա), was the sixth known king of Urartu, reigning from 786 BC to 764 BC. He founded the citadel of Erebuni in 782 BC, which is the present capital of Armenia, Yerevan.[1]

He's an Urartian king and founded the modern day Armenian capital. 

And since you say Urartian was not IE, here's this little bit of info: 
Linguists believe that the name Argištiše has Indo-European etymology (Armenian).[3] Compare Armenian արեգ (translit. areg) – “sun deity”, “sun”, Phrygian ΑΡΕJΑΣΤΙΝ (translit. Areyastin) - “epithet of the great mother” and Ancient Greek αργεστής (translit. argestes) - “shining”, “brilliant”, “white”, “bright”.

I have a lot more to respond to what you said, but my busy schedule makes it tough, ill address your other points later.
包含语种1:English，语种2:Greek