Humm, I had not heard of that Embark DNA health test. It sounds like a good idea and a pretty simple test to do.
The one I've heard most about over the years is the OFA testing which started as mainly testing for hip dysplasia in dogs. Looking at their site quickly, it looks like they do a lot more testing.
https://www.ofa.org/diseases/breed-statistics#detail
If you look up American Pit Bull Terrier, they list off several tests. I know some pit bulls have had hip and elbow problems. I know little about health testing but I think those OFA tests mean taking x-rays of the hips and elbows.
Anyone here ever had this done?