Think if he needed a defender he would. He isn't stupid enough to think Maguire will play like he does under Ralf for pep. And wanted him at that price a couple of years ago.
Two years ago, the player was 26 just before March, so the season in question. He was also an unexplored talent as far as 'big time' is concerned and he may have been seen as malleable. Two years ago has no bearing on now; two years ago, Neymar was a premium talent who would have been sold for a world record fee; Messi was the unthinkable, un-transferable talent, and so on and so forth.
Football is dynamic and the stock of players can rise, fall, shoot through the roof or plummet through the floor. Each person assessing Maguire will determine what they think his stock stands at, but using barometers from two years ago is a redundancy.
The market, and the players who are available are also going to be a measuring stick for value, and even the logic of pursuit. In all honesty, why is a club going to single out Maguire, with his age, wage and previous season, for purchase unless at an astronomical knockdown price? Even on half the wage, it's a serious chunk of change, who is going to pay that?