It's not just a "made up back story" or a "false history"; it's using that fantasy as a pretext for accepting awards and advantages that were established specifically for Indigenous people - to some degree, in order to rectify historical injustices - and thus depriving genuine indigenous persons of those awards and advantages that is unconscionable. This is not a small matter, and distinguishes Buffy's case from those of Grey Owl, Long Lance, and other such imposters that I've heard of. I'm not out to get Buffy; as I say, she's paying the price - but if the matter is to be discussed, it is important not to gloss over its most egregious aspects.