what is Khamzats style

So everyone knows that Khamzat Chimaev has very good grappling, but I can not find what his specific style is, usually people just say high level grappling. I see that he won freestyle wrestling competitions in sweden so is his style like olympic wrestling. He's from chechnya and of course fighters from the caucuses are always associated with Sambo. So in his fights does he use a mix of both or something else?