I think you have to highlight a couple of caveats there. First would be their contrasting styles of play, between a fearsome stopper like Vidic and an all-rounder like Van Dijk. Nowhere in that set of statistics does it really measure how well a defender reads the game. You could make a case for 'interceptions' and 'errors leading to goal', but they only measure part of it. The best defenders don't always make the most tackles and generally don't need to go to ground unless they've already made a mistake. It's also worth considering how teams play now compared to then with a significant increase in short possession play and much less back-to-front direct football. And Liverpool/City racking up points records this campaign that means their defenders have had less traditional defending to do.
All of that said, the stats are impressive for Vidic and shows how worthy he was of his PL player of the year award in that season.
Yeah of course some things you might not measure in stats, but he was almost faultless that season. VVD with Rio would be more appropriate comparison, but since we opened this can of worms...
Also you have to take in consideration how Pool set up and how well their midfield protects the back four. The didn't have the same luxury in the 4-4-2 or 4-3-3 we employed.
We often played Carrick, Fletcher and Scholes as a midfield 2 that year so it's fair to say he didn't have the luxury to not being put on constant pressure. Liverpool play obviously attacking football and you also have to bear in mind 10 years ago teams like Chelsea, Arsenal were much better than now and making it deep in CL, whilst also shading it as the best league, just before Barca and Real took over.
Rio also missed ton of games that season, only played 20 something in the league, which makes Vidic stats even more impressive.
Rio and Vidic played 3 CL finals (winning one of them), won 5 PL titles and whilst stats aren't always all that were much more consistent than what VVD could muster so far.
VVD could get there and be in the same bracket, but IMO needs a bit more time and to show the same class and consistency like in the last year and half at Pool.