Probably because they're Vikings who came from Scandinavia around the 8th-9th century, whereas the Inuit/other indigenous people have lived in their region since the BC times. Iceland seems to have only been habitable with the "modern" technology.
I also find it fascinating, it's a place where there's no "colonializers" and "colonized"...
That Denmark treated Iceland as a colony (and very poorly for a long time) isn’t exactly news despite there being common lineage all over Western Europe.
I think the implication is, that like the Maoris in New Zealand, they're only faux indigenous, as they arrived on boats. Probably doesn't matter much as there is no grift to be had.
I also find it fascinating, it's a place where there's no "colonializers" and "colonized"...