I wouldnt put to much stock in the WJC as a milestone on how much a player has progressed one way or the other. In such tournaments some players get snakebitten, others go on a unusual hot streak. Then there are other factors that come into play such as team quality, line chemistry or the whole covid situation this year. Holz performed well in the SHL so far, wich should be a much more important indicator of his progress this year. A couple of months ago everyone said he is a steal and compared him to some of the better goal scorers in the NHL and now he is a disapointment all of a sudden. Typical hfboards recency bias, wich is even stronger right now because people hadnt had hockey in NA since the NHL playoffs.