No, that was never the question I was answering. The original post I was responding to was saying that TSMC will ditch AMD for Intel. And their proof was a link to a rumor.The question was if they can buy enough to limit the amount of wafers that intel could buy, not if they can buy enough to make a profit for themselves.
If "the leftovers" is the large majority of wafers then it doesn't make any sense.
AMD will never buy up fab capacity to shut out Intel, that does not make business sense. They will only buy what they need to produce their products.