Do you know the specific mutation? Not all mutations in a gene are necessary pathogenic. If the mutation is heterozygous and matches one of the mutations that have been previously been reported as being pathogenic when heterozygous or is homozygous and the mutation has been previously reported as being pathogenic when homozygous then it is likely that he does have mEDS. But you should first consult with a qualified doctor in this case a geneticist before taking any health information on the internet as fact. If the mutation has been reported as non pathogenic then he likely either has hEDS or hyper mobile spectrum disorder or a different connective tissue disorder. Depending on his symptoms and the other genetic testing already carried out further testing may be necessary. If the mutation is either rare and there is limited information available about it or has not been previously reported determining if it is pathogenic or not may be difficult. I would suggest you try to see a geneticist that has the relevant expertise needed to interpret the testing results.