His walk rate dropped, but his K-rate didn't increase. No decline at all in PD stats (O-swing, Z-contact, O-contact, swinging strike % were all fine). 4th-highest hard-hit % of career. FB% above his career average. 5th highest average exit velocity in baseball.
His BABIP was 80 points below his career average, and 45 points below his previous career low, and everything in his contact profile suggests that this was just bad luck. And he still had a 109 wRC+.
Hitting in a hitters park, and staying healthy by playing DH, it's not unreasonable at all to think he could pop 25+ homers and put up a 125 wRC+.