I disagree. For me, his two main faults are losing track of his man (set pieces especially) & getting himself involved in tight situation that he really shouldn't get into, particularly in the box. By that I mean that he holds on to the ball far too long in many cases, & falls foul to the opposition nicking the ball from him in perilous situations. I don't really see why a better midfield in front of him would make him perform better in either of these situations.
Llorente is a ball playing defender. The issue he had last season without Philllips in front is that he had no options to pass to. He refuses to just lump it so gets himself caught in possession. If we improve the midfield and give him more options then he won't have to take as many risks, he'll simply play the ball to the free man.
He's not the best out and out defender but he is clever. He had no long ball to Bamford and no ball to play through the middle. Get a striker in and a couple of midfielders who show for the ball and Llorente will thrive much like he did for large parts of the first season.