Buehler has actually been pretty tough on the Brewers in his career (Brewers hitting under .200 against him for his career.).
When they beat him in the 2018 NLCS, he didn’t pitch poorly (7IP 6H, 4ER, 1BB, 8K), the Dodgers didn’t score on offense.
Outside of King and Miller, he’s the Padres pitcher who scares me the most, because if he can command his breaking stuff to consistently stay ahead in the count, he won’t have to throw his hittable fastball much and will quietly throw 6 innings