I agree these should not be put in. As they dont look like ww2 tanks they look like cold war tanks wich they are. The black prince still looks like a ww2 tank.
All of them are tanks of the Second World War, only the T-44 and IS-3 are serial tanks that did not make it to the war due to childhood illnesses. A tank that does not participate in the war has no place in World War II, and even more so for a prototype from 1945 to 1942. There is always an easy way to go to an alternative history - Operation Unthinkable, you can fantasize as much as you like: Black Prince, T-44, IS-3, production of the E series of tanks by the Germans under the supervision of the Allies, Czechoslovaks producing German tanks (what they did in the occupation) and fighting on the Soviet side. Any dream. Leave WWII with WWII tanks.