I think he can almost definitely speak english he just won't do it to the cameras for one reason or another.
He's done an OK job, about par for the course. Soton just had a really good start to the campaign which blew him slightly out of proportion, he does have them playing a nice style of football though. The trouble with how they play is he doesn't have a big enough squad for it, tiring, hard working football and he doesn't have the players to take out key people like Lallana and rest them without sacraficing quality.