I think the home run numbers are down to more than just the baseball. One stat that stood out to me was...
'The Yankees’ 43 homers at Camden Yards this season is more than the Giants or Tigers have in their home ballparks.'
This article seems to suggest the ball may be one factor, but analytics in batting techniques is (potentially) the bigger reason
https://www.si.com/mlb/2019/06/12/ho...tats-fly-balls
Either way, wouldn't want to be the Orioles this season