That is not backup, that is speculation with no evidence to support it. A gpu expects 12v within certain tolerances and demands that up to maximum current/wattage. It has no way of knowing if a psu will be able to deliver higher current and maintain 12v. A psu is dumb and has no communication with other parts, it supplies stable voltages. Everything I have seen through experience and what I have read from trustworthy sources is if the psu goes to far out of tolerance then that is when stability issues occur, but not throttling, how would the gpu know to throttle. I have never seen a trustworthy review/article show otherwise. As far as I can tell is this is just another internet myth. Find me a trustworthy review where they benchmark the same gpu on different psu’s and get different performance and I will happily change my mind.