And how does that negate the statement?
Sunak would not be in a national office if there was not a critical mass of his co-ethnics in the country as a whole.
Unverifiable assertion. Benjamin Disraeli became Prime Minister (and one of the greatest) in 1868 with no 'critical mass' of Jews in the UK. There's a far larger 'critical mass' of Muslims than Hindus in the UK. If your belief in cause and effect had any merit, would you not expect the ethnic factor to be a hindrance rather than an aid to the rise of a Hindu to such high office?