Saying today's Europeans are not indigenous in comparison to Sami, is wrong in three points:
First point: The Sami ancestors migrated in the Bronze Age into Europe, while Neolithic Farmers and European HGs migrated much earlier.
Second point: Saying there was no Scandinavian Nation, but Sami Nation, is wrong, because it is very unlikely that the Sami founded any kind of modern Nation before the native Scandinavians did. They lived in tribes, while Europe already had bigger tribal complexes and some kind of nations/large cultural complexes over distant areas.
Who lived in Scandinavia before the arrival of the Sami? Funnel Beaker, Pitted Ware for example, which are both related to modern Scandinavians.
Third point: Saying today's Europeans are not indigenous, because they descended from Bronze Age immigrants is wrong. Those immigrants where not a completely genetic different race/ethnicity, but already a mix of EEF, ANE and HG populations.
Their total genetic impact on today's populations besides Y-Haplogroups is low. Most Europeans still carry the neolithic allele variants for many traits, because they where superior for a modern lifestyle.
Ancestry components that are used today to predict the origin of people, are mostly not trait related SNPs and do not correspond with them.
The occurrence of more and more depigmentation variants is not associated with Bronze Age migration, but with later cultural/environmental changes that favored them. The alleles for blonde hair, light skin and blue eyes where already present in SHG, Anatolia HG and ANE. There is no single ancient population that had a blonde, blue eyed and light skinned man as their main phenotype and conquered all others.
Saying they are no more indigenous, because there was an invasion, is like saying today's Native American tribes are not native anymore, because they often have European haplogroups and admixture, or saying Afro Americans are not Africans anymore.
The Sami are part indigenous, because they lived here for a long long time, but all other Europeans are indigenous too and most are much more indigenous then the Sami.