For what it's worth, I actually think Van Dijk is an excellent defender, his organisation is a strength and he just covers so much ground, but because Liverpool were so good last year, people overlooked the fact that he has mistakes in him, but overall, an excellent defender.
Come back to me, when he has 10 solid years at the top like Vidic, Ferdinand, Terry, Kompany and i'll happily engage on who is the best CB, and include Van Dijk, that BBC article is nothing more than clickbait, as neither have him near the top anyway.
As for City, yes they've spent a lot of money on defensive players which haven't been a success (Mendy, Danilo, Ake), but that Días is just playing so so well, aided by the resurgence of John Stones, who is in the form of his life. I remember watching Serie A growing up, and seeing Nesta, Maldini, Cannavaro, Stam command the defence so well, same with Puyol in Spain, literally willing to do anything to put their team first, and it was truly a joy to behold, watching Días this season has been like watching them in their prime.
No one really gives defenders the same compliments as attackers, but I'd pay money to see that Días, what a player.