not very accurate historically ... actual "Vinland" was NORTH AMERICA ... NOT ENGLAND ... but ... I have read some of the manga, so I'll at least take a look at the anime https://en.wikipedia.org/wiki/Vinland https://www.ancient.eu/Vinland/

i've only seen ep 1 so far but i thought they were clearly talking about north america as the man leif says he met native americans? he's even the same guy in that wiki page you just posted so i don't know what you're trying to prove.