This was a man who regularly ate marine food.

Not someone who had merely passed through coastal territory once, but someone whose diet over an extended period included a substantial marine component.

That kind of dietary signature, in the context of the region and period, suggests either that he lived part of his life on or near the coast, that he had regular access to coastal trade goods including dried or smoked marine fish, or some combination of both.

The hair analysis added detail to the picture.