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looking into the possibility of Indian groups receiving Steppe related ancestry after 1500 BC

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From the  Supplementary Materials for The formation of human populations in South and Central Asia  by  Narasimhan et al. 2019 : A claim made in The formation of human populations in South and Central Asia by Narasimhan et al. 2019 and the Steppe theorists is that the Steppe related ancestry present in the Indian people entered within 2000-1500 BC. and this is based on groups like Ksirov_H_Kushan and Steppe_LBA that have high admixture from East Asian related groups. however  Genetic continuity of Indo-Iranian speakers since the Iron Age in southern Central Asia by Vignon et al. 2022 has some interesting information. from  aat7487_tables1-5.xlsx  of  Narasimhan et al. 2019 they model Turkmenistan_IA which is dated to around 912-799 calBCE without East Asian admixture and also claim most of the East Asian admixture in the Central Steppe only arrived towards the end of the Iron Age however Steppe theorists would like to respond by saying that ...
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Looking Into The Actual Percentage Of Yamnaya Related R1b from both Armenia_MBA/IA and Hasanlu_IA and Hajji_Firuz_IA.

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A claim that is at often times made by the steppe theorist is that the Steppe related ancestry in both Armenia_MBA/IA and Hasanlu_IA, Hajji_Firuz_IA is heavily mediated by the males but lets look into the data from Lazaridis et al. 2022 to verify this claim. the samples that actaully have proper evidence that they r most likely mediated by males from the steppes is y-dna haplogroup R-M12149 and R-M269. from Haplotree.info from familytreedna.com also from Haplotree.info however once we actually look into the actually number of individuals with this haplogroup from both Armenia and Iran it would actually be quite less . The following information is based on  science.abm4247_data_s1 from science.abm4247_data_s1_to_s5 from Lazaridis et al. 2022 in a study named The genetic history of the Southern Arc: A bridge between West Asia and Europe . As we can see only 7 Individuals out of 36 Individuals in Armenia and 3 out of 11 individuals in Iran with y-dna haplogro...
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The origins of the Hurro-Urartians and an update on the possible source of haplogroup R1a-M17/M198 for the Indo-Iranians

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the Kassites are said to be a group of people who are similar to the Hurro-Urartians in terms of linguistics the study by Lazaridis, Alpaslan-Roodenberg et al. 2022 noted how Levant_PPN related ancestry heavily increased with some samples reaching around 33% this ancestry might might be a representative of the reason behind the existence of non Indo European languages like Elamite aswell. the following information is from  Supplementary Materials for The genetic history of the Southern Arc: A bridge between West Asia and Europe by Iosif Lazaridis, Songül Alpaslan-Roodenberg et al. 2022 .  Levant_PPN related ancestry was 9% on average during the existence of the Kura–Araxes culture while 1 samples had this ancestry at around 24% around that time. during the MBA 3 samples also had this ancestry at around 25%. during MBA to LBA it increased by a few more percentages with an outlier reaching around 19% with the averages reaching somewhere between 12-15%. and during LBA to EI...
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