They are implying that the South Asian voters are his (you can not peel away something unless someone already has it) because his parents are Egyptian immigrants.
The sub-text here is "all people with skin darker than a paper bag stick together". Or all migrants support each other. This is, of course, not the case but it is a narrative pushed by the media.
With all due respect, I think that’s more your inference than what’s implied in the article. Voters of Indian decent in Michigan have leaned slightly more towards Democrats, though that has flipped recently. Still, it’s roughly 50/50. So I thought the implication was clear that by insulting a prominent public figure of Indian descent El-Sayed might lose votes that otherwise might be reflexively cast for the Dem. I didn’t think his Egyptian background or Islam had anything to do with it. Only about 10-15% of Indians in the U.S. are Muslims.