PlayStation 4 Slim has been supporting games PlayStaion 3?

Nickel17
If I'm not mistaken, the PS4 has no backward compatibility, except for the streaming service PS NOW, which supports only a certain list of games and does not support Russia.

No. From now on, no backward compatibility.

The last time the support of the previous generation Slim version of the console was on the PS2.

Nickel17 wrote:
Just past the Slim versions of consoles was the latest games of the previous console.
But as Sony was then going to sell the same game several times.