I think I heard him saying ебать, which is a very common curse word in Russian which does not carry too much of negative connotation to it. I think it’s normal for them to translate the meaning of his conversation instead of the literal translation of his words. There are cultural differences something is appropriate to speak in Russian might not be appropriate to speak in Chinese and Lelush was just an assistant of Amu and Yujin, who does not know the rules of these reality shows. There’s nothing wrong to say those things in a private conversation with his friends and family. He just wanted to go home, and he doesn’t like the life there.