The Swastika may be an Indian symbol but the Indo-Aryans did not originate in India. There is a lot of historical evidence that Indo-Aryans originated as a steppe culture in Central Asia around the neolithic to early bronze period and then spread to Europe and East Asia. This is also why the structure of so many Indo-European languages is similar; they all have a common ancestor in the Proto-Indo-European language.
Iirc, their theory was that the Aryan race originates in India and the swastika is an Aryan symbol.
The Swastika may be an Indian symbol but the Indo-Aryans did not originate in India. There is a lot of historical evidence that Indo-Aryans originated as a steppe culture in Central Asia around the neolithic to early bronze period and then spread to Europe and East Asia. This is also why the structure of so many Indo-European languages is similar; they all have a common ancestor in the Proto-Indo-European language.