Given that they were two minutes ahead of the field indicated that Nino was in top form, head and shoulders above the rest.
And the surprise was not that MVDP won but the ruthless precision on how it was done. MVDP stepped it up, Nino dug deeeeeeep and closed the gap, and then the 1300 watt move came. It was so harsh that it was passing of the baton of sorts.
Have in mind he has been trying for 2 years to get a win in WC XCO and has just attain it.
In 2017 he only went for a WC win, which he couldn't in a couple of WC's. In 2018 he actually was second overall, but couldn't get any win. It just is incredibly hard to win a WC in XCO, very few have achieve that in the last decade in elite men.
Also Nino isn't in top form right now by any means, for mountain bikers season is just starting, they have to drag their form for the last WC races and world championship, which was exactly what happened last year.
After Nino's perfect season in 2017, in 2018 the first race was won by Sam Gaze when he was in peak form due to the Australian games, after that win he was nowhere the entire season. I would argue the same thing would happen to MDVP this year as he is already in top form due to his racing schedule and I would argue he wouldn't be able to keep up his form shown in the last race for the remainder of the season. We won't be able to tell though, as he will miss the next WC's.
You seem to be reading too much into MDVP's hype, no doubt he is a phenomenal rider, but you just can't excel in many cycling disciplines. History has shown us that, only one that has done it was a women (Pauline Ferran Prevot), he won cyclocross, road and mountain bikes in one year, but you could argue women cycling hasn't reached its peak in performance, hence why a very talented rider could do it across disciplines.