I don't see the need to disparage BART in this discussion. They provide information to adopters about Fanconi and whether the dog has had the DNA linkage test.
The language on the Camp Basenji site isn't clear that all the dogs are DNA tested, since it says "If Fanconi is identified very early in the disease process, just when bicarbs are starting to be lost, prior to spilling glucose (the true start to the disease process as we know it now), the disease will have VERY little impact on the overall health of the basenji as long as supplements are begun immediately. We think basenjis affected with Fanconi deserve a safe and healthy life, so we will make sure that all of our basenjis are tested for Fanconi by DNA testing and/or venous blood gas testing as appropriate. We can then make sure that any with Fanconi are placed in homes that will have the vetting resources available."
The "true start" of the disease is still unknown, but the direct linkage DNA test shows whether the dog is at risk at all. I get the impression more weight is being given to blood gases.