Important! If you score 90 for the Ertebølle culture and 30 for the Vikings, this does not mean that you are genetically closer to the Ertebølle people than to the Vikings. It only means that you are closer to the Ertebølle people than most modern Europeans are, whereas most modern Europeans are closer to the Vikings than you are.
Because the Vikings lived much more recently, you are likely genetically more similar to them than to the people of the far older Ertebølle culture. Keep that in mind when looking at the scores!
Also: When it says "closer than all Europeans", what is meant is of course the underlying reference values of modern Europeans. However, the values were weighted by the population size of the respective country, so the results can be indeed transferred to today's Europe and one can speak genetically with some reliability of "all Europeans". However, the countries for which there is no data yet are left out.