This is exactly how things happened, Russian history books never lie.
In all seriousness, though, I would not mind a proper action RPG based on this or at least in the same setting. I mean, theoretically, you could even add more NPC and dialogues to an existing game, but I would prefer a relatively big world, where you can explore stuff, and perhaps even explore the culture of the Lizards among other things.
Actually, back in 2020 I had some notes inspired by Былина which were based on Kiev's Rus mythology and real-life geography. It had "nonhumans", so they could be replaced by Lizards, I guess. Notes can be found here if anyone is interested (in Russian).