This is an enormous stretch. Binning mostly allows manufacturers to avoid having to throw away ICs with certain defects, selling them instead as a different SKU (fewer cores, lower clock, worse power consumption etc).

I think Intel abused this at least once, back in the days when they had ridiculously good yields across the board, but let's not generalize in absence of evidence.

Binning is a lot of it, but what happens when they have more of the good bin than they want, for the market proportions they're targetting? They'd be fools not to either just sell the good as the bad, when nobody can tell (like when acheivable frequency is the difference), or more likely just make it bad then sell it.