This is mostly just a larp on their part. I think for the most part it’s actually the opposite, a massive chunk of muslim Indians are Dalit converts
There was some mixing of upper caste Muslim Indians with foreigners during the Muslim rule over India, but I’m doubtful there was much of a lasting genetic impact. Even for the Mughal (Timurid) dynasty which started out as fully non-curry, the sons of the last Emperor looked like this
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I’m aware black and white photos can make people look more poop skinned than they actually are, but if you compared these to colorless photos of iranians, uzbeks, etc. from the same era I’m sure the difference would be more than noticeable
The muslim curries with substantial MENA and Turkic mix are the ones far up in the North of the subcon. An example would be that Aslanpahari guy on tiktok, he’s from an Indic ethnicity I think but he’s from KPK which has a significant Iranic population, which is why he’s so much whiter than most curries and could pass as MENA