He doesn't in any way resemble a Sikh in "Space Seed," regardless of what McGivers suggested as a likelihood. She was a really bad historian;
Eh, that's on the lazy writers who should have known better, but who maybe didn't even believe the audience would notice or care.
The writers/showrunners threw McGivers under the bus with the bad historian stuff, by making her be attracted to an abuser, by preferring an object of history to her Starfleet duties.
Anyway, assuming all these traits are reflective of an actual character in-universe, it's a wonder she was assigned to the
Enterprise in the first place. A ship with people like that on board is the sorta ship where you'd expect Scotty to be dealing drugs.