The Aryan civilization is not in Europe. Its been called Arya since thousands of years, literally thousands of years. And its people are called Aryans.
The culture, philosophy, social order, etc are different from that of Europe and other civilizations.
Aryans are not a race or an ethnicity or any of those things. Its a group of nations.
For the genetics part. Actually Europeans do share a significant genetic resemblance to that of central Asia and north of Iran with the resemblance fading the more you go south. And if you looked at the maps, The spread of haplogroup R1a lines up with where the Parthians lived and established their nation after the migrated from eastern Europe. Parthians and Persians in general are the ones who called modern day Iran and Turkmenistan Arya, meaning land of the Aryans.
If you looked at the ethnic and cultural spread inside of Iran, you'd notice that this map also shows the Persians whom include Parthians are centered also exactly where the haplogroup R1a is present the most, while the further west you go to the areas that were conquered by the Persians and incorporated into the various Persian empires, the less this genetic group is present.
So, in summary. If we were to talk about the Aryan civilization and culture, Persians and central Asians are the ones who preserved it and formed it to a nation and a civilization. And called their nation that as well. While Europeans formed an entirely different civilization and culture, or more accurately, ditched theirs and followed the Greeks and thus became the western civilization.
If we were to talk about genetics and race, then yes, Persians and a good chunk of Europeans come from the same origin and race.
In regard to the Swastika, the Swastika is a proto-Zoroastrian symbol which is basically the ancient spiritual philosophy of the Aryan people in which we preserved and you ditched and replaced it. So in that sense, yes its our symbol not yours.
add: And the genetic mark doesn't exist in all of Europe, just some parts of it. While its spread in low concentration through Europe just like its spread in low concentration through central Asia and Indus valley. This is due to intermixing between people through the ages.
You're quoting this part
being most prevalent in Poland, Hungary, the Czech Republic, Slovakia, Belarus, Russia and Ukraine in Europe and in central Asia, Afghanistan, Pakistan and India in Asia.
And it doesn't say its most prevalent in Poland specifically, but it says its most prevalent in those countries and regions including Poland . And it mentions Central Asia where Iran and Turkmenistan are, and where the Parthian or Persian people in general come from.
And as i stated, if you followed the appearance of the Swastika, you'd find that it first appeared in North of Iran and then started appearing further south. Which means its a symbol held by the group of Aryans who migrated to Iran and central Asia. And then it starts appearing in the Indus valley and northern India which means some parts of the group that migrated to central Asia, kept migrating further south.