I have never seen a defender having this much smoke blown his way after having one(albeit excellent) season. You have the likes of Kompany coming and saying he is the best defender to have played in the PL.
Agreed. I guess it's mostly because he has so few current competitors, and there's been no truly elite centre back for the entire decade. When Rio peaked in 2008 you had Cannavaro winning the ballon d'Or two years prior, his partner Nesta being every bit as good, Terry and Carvalho setting defensive records, Vidic alongside him - it just wasn't that impressive to see an elite defender, even if Rio was particularly exceptional then. You also had people split on who was the best based on stylistic differences, Rio or Vidic, Terry or Carvalho, Nesta or Cannavaro - and so the pundits' discussion would inevitably get to focusing on the weaker elements of each of their games.
For van Dijk, there's no suitable comparison point. No elite stoppers to highlight the deficiencies that result from his own style, no recent defensive peaks that he's being compared against - he's just much better than all of those comparison points. It just makes it much easier to slip into the historical superlatives. It's just reality that most people's memories are not very good.
That said, no matter what happens what van Dijk did last season was one of the best defensive performances I've ever seen, and will go down in history as a special season for a defender due to the personal awards. A relentless focus on his mistakes this season to try and erase that fact would be incredibly petty. Surely people have better things to do.