China has extremely powerful group of lobbying. They have ability to control a nation. They have silenced a peaceful protest condemning Uyghurs treatment in germany - "...Think about your family" they said.[2] I doubt even Germany could do anything. Just yesterday, they raised concern of referring Genghis Khan as mongol, shamelessly trying to rewrite history.[1]
I heard a Yale history professor make a similar claim that the Huns were closely related to the nomadic people now in mongolia. I’m sure china is saying so for propaganda reasons but the best propaganda contains a lot of truth.