A. Parpola is an abundant writer, but not very rational. - Gérard Fussman

The sacrifice of horses, in fact, is in no way specific to Vedic India: only the ritual of this sacrifice is, very different from that of the funerary ritual of Sintashta. The Indian aśvamedha is in no way a funeral ritual. Likewise, that the i-e name (?) of the chariot (ratha) is only attested in the i-ir languages does not mean that it is an i-ir invention, because, like so many others words, its equivalent may have disappeared from other languages i-e and because having a word to designate the war chariot does not mean that they invented it.

806 Fussman G. Entre fantasmes, science et politique. L’entrée des Āryas en Inde. Annales Histoire, Sciences Sociales. 2003;58(4):779-813.

Nevertheless, since the beginning of the 19th century, Westerners have agreed to place the habitat of the p-i-e-speaking people(s) in central or eastern Europe, more rarely in Scandinavia, in any case not in Iran, nor in India...
European historians, who all considered it proven that the existence of languages of indo-european origin in India resulted from a movement of peoples from the North, could be content to draw large arrows on the maps representing the archaeologically empty territories where they had necessarily passed before crossing the Hindu-Kush barrier and penetrating into North-West India. It now appears that these territories were populated, urbanized and linked together by a complex network of commercial and cultural relations. Archaeologists then find themselves faced with the classic problem of having to correlate a material culture and a language.