If the property was the person's principal residence for the entire time they owned it, and not used for rental or business purposes, then Indigenous or not, they will not pay tax on the sale. There is no capital gain (or loss).
If the property was not the person's principal residence for the entire time they owned it, then an Indigenous person would be exempt from tax on the capital gains if the property was located on a reserve.
Please see this Canada Revenue Agency (CRA) webpages for more information: Information on the tax exemption under section 87 of the Indian Act
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