While seen as a whole this might be true, but if you look at the major cities the story is very different. The latest statistic from Oslo[1] shows that 32.8% are immigrants and 40% of these are from Europe. So between 15-20% of Oslo are "non-western" immigrants which I think is what you are aiming for.

I don't know what counts as homogeneous and not, but if you walk around in Oslo you see a lot more colours than white :)

[1] https://www.oslo.kommune.no/politikk-og-administrasjon/stati...