Pretty sure that's not right. I recall him being pretty dominant as a late inning reliever a few years ago. He had two great years, then had issues with walks. He's still young and still has excellent stuff. Those guys don't grow on trees, even these days.
Career ERA in the 8th inning (presumably higher leverage on balance than the rest of the innings he's pitched): 5.29. Career ERA in all other innings: 1.43
Based on Fangraphs low/medium/high leverage numbers:
Career FIP: Low leverage: 2.95; medium leverage: 2.90; high leverage: 5.46
Career K:BB: Low leverage: 3.03; medium leverage: 2.46; high leverage: 1.55
Career ER (Fangraphs doesn't calculate an ERA for some reason): Low leverage: 12 ER in 68 1/3 IP; medium leverage: 21 ER in 67 2/3 IP; high leverage: 27 ER in 28 2/3 IP