Maybe they change their rules. When they started accepting rapid antigen tests for BVI entry they specified No Home Tests. Only tests from a certified lab and they gave this list of approved tests. That list was always kind of nonsense because the CVS tests aren't listed either but I've never heard of one being rejected.
For what's it's worth, the negative covid test results you get from EMED do show to be CLIA Certified on the paperwork which was one of the requirements I remember reading. Maybe that's the difference between the others. Perhaps it's similar to the insurance requirements stating very specific coverages....but many people have gotten by with just a generic letter stating COVID coverage.
