That just speaks to the fact that we have more "Celtic blood" than most people in this region. Perhaps certain marriage patterns contributed to this....
I wouldn't use "discredited" exactly. Popsci writing is necessary for the public to digest scientific research and i don't think making a few guesses...
It obviously isn't prominent at all, is it just listed as L? There should be at least a clade down i.e. L0/L3 etc. I have seen stranger though, like...
Regardless of whether LIB11 actually spoke Slavic - he does seem to harbor significant ancestry similar to Av2. This is just a single sample probably...
