Nomad cities? What the hell are those? Are you trying to say that nomads like say, Volga Bulgars, had cities like Bulgar where many different people such as vikings came to trade? What are you on dude, real history? Next you'll go ahead and claim that Khazars had a fortress named Sarkel and even had the Byzantine Empire build it for them. I am curious as to what more laughable claims you'll make! Will you also claim that nomads should use diarchy mechanic and say Khazars, Magyars, Danube Bulgars, Avars etc. had it? I bet you probably even made up names for those like kavkhan for Bulgars, jugurrus for Avars, kende for Magyars.
Edit: Oh and I forgot, you'll possibly also claim that it is possible that Kyiv has been founded by Khazars or Magyars.