This narrative is internally consistent with the evidence.

It fits the data points.

But it is a narrative of speculation, not of established fact.

The data points support multiple narratives, not just one.

He could have been born locally, descended from Scandinavian settlers whose families had been in the Humber region for generations.

He could have been a Norman with Scandinavian ancestry, and the Normans themselves were Scandinavian-descended, so continental European DNA with cold-climate tooth chemistry could fit a Norman origin rather than a purely Scandinavian one.

He could have been a Flemish merchant.