Nothing you said doesn’t change the fact it wasn’t a myth. It existed and as you said you have no indication if it was available in a meaningful quantity. Which means it also could have been available in quantities to meet the demand for a $999 2080 Ti. It existed, wasn’t a ‘myth’ regardless if it was one SKU or 10.
Point is making statements like “the 2080 Ti was only $300 more than the 2080” are misleading at best. That clearly was not the case.