So basically, mixed-race Indians are banned from holding office?
No.
After India became a Republic, it reserved 2 seats out of 535 in their version of Congresd.
These 2 were reserved for Indians who had some British blood. It’s not mixed race as Indians are the same race, caucasian, as Brits.
Now the Anglo Indians have assimilated and are at just 300k in a country of 1.3 billion.
They can still stand on their own merit rather than get nominated with no elections, for seats in the parliament