It is interesting, actually they have known this for some time, they already had connected that the Clovis points were technology from europe and not asia some time ago. Also I saw an episode of "America Unearthed (Scott Wolters? History Chanel) a few years back where he went to a swamp in Florida where ancient european style burials had taken place, both the skeletal morphology was european as well as the artifacts excavated, DNA was blocked in court by the local tribes I think. Anyways the gravesites were 11,000 yrs+. He went to the Smithsonian and interviewed a forensic pathologist or an archaeologist who admitted on camera that the Smithsonian had known for 30 years that Europeans were the first to migrate to America 15,000+ years ago.

This is just not something that the MSM likes to talk about as the tribes accross the country get offended regarding this topic