From a statistical standpoint, thus far this season has been an anomaly. Vardon averages are very much a function of which events one plays in. If all you want is a low Vardon average, avoid the majors (especially US Open), the Memorial, and a few other events generally played on tough tracks...and focus on the Bob Hope Desert Classic, Harbor Town, etc. (be pleased to figure out current names for some of these events for you kiddies).
So this year it is past Father's Day and we have not had the originally scheduled Masters, US Open, Memorial, Players Championship or PGA Championship because of COVID (to be fair PGA played this early only 1x previously in last 40+ years...2019). Hence the low scoring averages across the board this year.