I have traveled all over Galicia by car. Once in A Coruña, Northern Galicia, we stopped at a local Aquarium that was absolutely swarming with Galician children. Half, and I really mean 50%, of the kids had some form of light hair from dirty blond to light blond hair. I even saw a red haired freckled girl accompanied by her dark haired parents. It was quite spectacular to see the genetic studies were accurate.
In regards to this old debate, Galica has the highest percentage of Germanic DNA in Iberia , this is undisputed. However what most people fail to recognize is that every region of Spain and Porugal has substantial levels of Celtic DNA and it's almost uniformly distributed, with the highest frequencies being in the Northern part of the Peninsula. Were not talking about Y dna here because it doesnt tell much, I'm talking about autosomal DNA. Maybe Galicia doesnt have the #1 highest amount of Celtic DNA but it's probably number 2 or 3.
As for haplogroup E, we should not be suprised, if you know what your actually talking about, because the people who carried this came into Iberia thousands of years before the Celts and were part of the local population. Remember Galicia was a mixture of pre Celtic and Celtic peoples during the time of Roman occupation. The pre Roman people surely carried haplogroup E, and given Galicia's isolation of dense forest and mountains, it harbored as a sanctuary for ancient peoples. It has been proven in studies that most of the haplogroup E branches in Galicia or even Northern Portugal and Asturias has nothing to do with Medeival Moors.