Regarding antiquity... If you've read about Arkaim in the Chelyabinsk region, which is older than the Egyptian pyramids, I think you'd agree that our ancestors deserve to be called a civilized people with a very accurate calendar and an observatory that amazes modern scientists. And this was a period of paganism, thousands of years before Christianity was introduced in Russia. This is a genuine history because it is confirmed by facts, and as for the so-called chronicles, I agree that they were "kept" at all times by those in power. So, much in the history not only of Russia but of the world in general can be questioned. For example, the well-known chronicle history of Russia begins with the Baptism, as if before that, Russia was something primitive and incoherent. This suggests your analogy with Soviet history;)
It is clear that a "new broom" sweeps away everything that was before it, and Soviet ideologists are by no means the pioneers in this.