40% of his flyballs allowed are homers so far, so maybe he won't keep giving one up every other appearance. Velocity looks pretty well in line with his norms. He's giving up an alarming amount of hard contact, but GB/FB/LD are close to normal. His fastball has been a bad pitch and slider about average.
Uneducated guess, he's lost some movement on his fastball and it's not a competitive MLB pitch any longer, and he only has one other average pitch and is nibbling as a result, leading to the increased walk rates since 2017. Where have we seen this repertoire before?