No one said he was having a career year because he was scoring. He's having a career year because he's shooting 43% from 3 on double the attempts per game he has ever attempted before, shooting a career high 51% from two, also having career high TS% and PER, and career high ws/48, and career high VORP, all on the third lowest usage rate of his 7 year career.
Absolutely nothing to do with scoring or minutes, everything to do with his playing quality.