how does a wide MTB tyre have lower rolling resistance than a slim gravel tyre?

According to Bicyclerollingresistance.com, the fairly slick and 34mm wide Panaracer Gravel King has a rolling resistance of 20.8 W whereas the decidedly knobbly and 53 mm wide Continental Race King Protection comes in at 20.2 W. I’ve ridden the latter and I would find it hard to believe that a skinnier tyre feels faster.

Now I understand that the material alone can make some difference. But I feel I’m missing something along the lines of "Rolling resistance is in function of the tyre width", or "Rolling resistance is just one thing holding you back, there’s also another type of resistance that depends on the width of the tyre". Am I?