Yeah Rukas FYI the term "paki" is a big big racial slur here in the UK. I wouldn't advise you to ever use it on this side of the world. I know you meant it as an abbreviation for "pakistani" but it's just one of those things where you just have to say the full term.
So as for SiGh being Indian or Pakistani....the answer is no.
I think it's up to him to let everyone know what nationality he is. I'll point out that many mixed race people occasionally refer to themselves as one race and sometimes the other.
I'll also point out that some people consider their ethnicity to be where they born and raised, whilst it's not the true definition of the word, if the countries are not far away from each other it happens.
I don't think it's my place to say anything else.