The only thing I can say to this is that fantasy points are typically a measure of production. Better production typically leads to more points, and more points typically lead to more wins when you look at a large enough sample size. These were the top 10 fantasy QB leaders last year:
Fantasy Football Leaders Weeks 1 to 17 - QB | FantasyPros
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7 out of the top 10 fantasy QBs made the playoffs, and 2 out of the other 3 teams had QB changes during the season that split the fantasy stats up (Chicago and New Orleans). The only QB that made the playoffs while not in the fantasy top 10 and starting the whole year was Baker Mayfield.
Only Watson, Murray, and Herbert didn't make the playoffs.
All 4 teams that made the Championship game had QBs in the fantasy top 10.