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Well, Curonian settlemen on Gotland and Uralic male gene flow into Scandinavia via Alands during Viking age can't be explained by just capture of females. Not to mention that some of the English male ancestry that landed there during Viking times is shared with Estonians and not Scandinavians.

But frankly, this paper is not about captured females(which btw are more uniformly spread across whole Europe, so their capture even in Southern Europe would not radically add anything new to a Scandinavian female gene pool), when it specifically mentions whole populations coming to Scandinavia from Central Europe. It is differences in males that really make distinctive population groups.