I believe ~half of minor league parks have Statcast installed, and you can scrape data from the Baseball Savant website. And it's I think league by league, so like the PCL has it but the International League doesn't. I'd imagine the big boys like FG and BR won't spend the effort building out a process to add the data until it's available for all or at least most games. So what you've got now I believe is either sourced from teams, or is fairly piecemeal. Like I'm pretty sure Eno Sarris did a "best Stuff+ ratings in the PCL" article a bit ago, and the reason it was just the PCL was clearly the limits on data availability. Contact rate is an annoying thing that we should have though. FG has swinging strike rate available, so like the raw data should be there for contact rate.