As I said: It doesn't prove anything, but it implies that the Arcturian Heresy is true and the common belief of who Tiber was is false. The Heresy doesn't specify race, but that he is from an Island in the High Rock region which one then can interpret as one wishes when it comes to race.
Spoiler Jeg er fult klar over at Hjalti er et veldig nordisk navn, jeg sier bare at det beviser ingenting. Bare se p? Dunmeren in Riften som ble oppdratt av blant Argonianene

That is true. Maybe Talos/Hjalti was born in High Rock from Nede parents?
I got a friend whose father was born in a military camp in Germany, but he's fully Norwegian.
Or perhaps the Heresy is bullcrap, speculation or maybe even mistook some other Tongue for Talos?
Spoiler Oja, glemte han. Godt eksempel p? hva du mente.

I forget what source mentions it, but several of the Septim emperors were kings of Wayrest before taking the throne, which means they possibly married Bretons and had Breton children. I believe Daggerfall also makes brief mention that all the major royals of the Illiac Bay had some Septim blood.
According to the very beginning of http://www.imperial-library.info/content/wolf-queen, Pelagius Septim II definitely married a Breton, meaning the later emperors Magnus, Cephorus, and Pelagius III were at least part Breton.
Also when I think of it, I think Daggerfall had some letters proving that the late Uriel Septim had an affair with the queen of Daggarfall.
And the line to Talos is not direct, at some place early on the throne was taken in a coup by the Emperors cousin or something.