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I am afraid not, in that case, the person would need to live in the UK for another 5 years before they would qualify for British Citizenship.
It is therefore advisable that the person continues living in the UK after receiving settlement, obtains British Citizenship and then moves abroad if they so wish.
May I help further?
Because the rules for Citizenship and different from the rules for Settlement: https://www.gov.uk/apply-citizenship-indefinite-leave-to-remain
All the best