According to nba.com , lol. I'm not cherry picking, there are just very few metrics on bbref that support that. (Including that he had our worst off rating and net rating.)
In the playoffs according to a website that by your own standards is inaccurate. Personally I dont think a couple playoffs games is enough to draw a sample size off of for the data to have any accuracy. His regular season games is a much better indicator because the sample size is much larger. But even that is still small. Here are a few other numbers from the regular:
Exum lead our team in Assists per 100 possessions(with less TOVs than Rubio).
Exum was our 2nd leading scorer per 100 possessions just behind Mitchell.
Exum had our highest offensive rating of 109.3
Exum had the 4th highest defensive rating of 98.9 just behind Gobert who was 97.7
Exum had our highest net rating of 10.4
Exum had our 2nd highest Ast/TO rating just behind Ingles
Exum played at the fatest pace of anyone on our team
Exum had our 3rd highest player impact rating on the team just behind Gobert and Favors
Exum had our highest points per possession in pick and roll situations as the ball handler at 0.91 just ahead of Mitchell at 0.81
Exum had our best FG% and EFG% as the pick and roll ball handler
Exum turned the ball over the 3rd least as the ball handler in pick and rolls ahead of Rubio but behind Burks and Mitchell
Exum was in the 80th percentile as the ball handler in pick and rolls in the NBA ahead of anyone on the Jazz by 30%
Exum had the second highest points per possession in isolation plays just behind Rubio
Exum had the best FG% and EFG% in isolation plays for the Jazz at 50%
Exum had the best FG% on the Jazz on Drives
Exum had the 2nd highest Ast % on drives behind Ingles
Exum had the lowest TOV% on drives on the Jazz
Exum had the best DFG% on the team just ahead of Favors and Gobert
Exum had our fastest Average speed while on the court especially on offense