Pettersson would need to score 0.68 points per game in the SHL to match his NHLe projection from last year in the Allsvenskan using this.
I don't think it's that accurate historically speaking for the top of the draft.
Most u20 players to score over 0.68 of note are really good NHLers 50-100+ points per seasons, yet this would predict him to score like 40 points a season. There's only been 6 u20 seasons since 2006 that had a player score 0.68 or more in the SHL.
Work needs to be done on this.