You are half right when you say: "Kamaz can't sell more trucks" but like a good propagandist ...you dont say why?
The reason is that Kamaz is a major truck/transport equipment supplier to the Russian Armed Forces and by your published stats on Russian truck/transport losses in this war, there is good reason that Kamaz's commercial sales are down ....ie: Kamaz is flat chat manufacturing for the armed forces and these numbers are not published because they are considered "National Security" war stats.