Sort of. They definitely perform this sort of binning, but the demand of the parts in the market and the success rates are things they have to estimate beforeha

Sort of. They definitely perform this sort of binning, but the demand of the parts in the market and the success rates are things they have to estimate beforehand. If they'd run out of the higher-end binned parts, they have sold out. But if they run out of the lower-end binned parts, they just relabel the higher-end parts and keep selling both lines. Yield also isn't constant, so odds are the number of parts binned higher goes up over time as well.