This piece seems a little confused about what it’s actually reporting on.

It’s well known, to the point of near-cliche, that the word “Viking” didn’t refer to a nationality or ethnicity. It meant something akin to “raider”. The ethnic group is usually referred to as the Norse, at least until they start differentiating into the modern nationalities of Danish, Swedish, Norwegian, Icelandic, and Faroese.

The actual finding here seems to be the discovery of the remains of some Viking raiders who weren’t ethnically Norse. Fair enough. There are also examples of Norse populations assimilating into other cultures, such as the Normans and Rus. Likewise, the traditionally Norse Varangian Guard accepted many Anglo-Saxon warriors whose lords didn’t survive the Norman conquest. So it’s not too surprising that someone of non-Nordic descent might be accepted into a Viking warband.