there were a bunch of really stupid scores in the open week or so of the season and I'm willing to wager the league 'suggested' to the umps that they should put an end to that and thus we've definitely had an oversized zone - but it seems it's been every crew and every park so that's why I don't think it's any kind of accident. You always have the outlier ump worse than the rest, but right now I think that is superimposed over an already enlarged zone. The league sees the video and statcast data every day just like everyone else. The zone can only be consistently biased in any direction if the league is validating what the umps are doing on an ongoing basis.
also keep in mind that the Fox/Bally graphic may or may not be that accurate. I haven't spent anytime comparing it to gamday recently - which is probably more accurate.