That may or may not be true. I'm not a lawyer. But, when I used to work for Intel; Intel made processors and chipsets. Intel stated categorically that although they made motherboards and the processors that went with them, they had no interest at all in putting them together in a box and making a PC - due to anti-trust and anti-competitive allegatiosn that would surely follow. To this day, Intel makes chipsets and processors - yet will NEVER put them in a box and sell that box to the consumer.
If I were them, I wouldn't either because they would likely come close to the 2/3 market share. I think things get a little fuzzy when one of their chips is second-sourced, like AMD has with many of the Intel chips. While AMD licenses the microcode from Intel, Justice might argue that Intel still benefits from AMD's sales and, therefore, AMD's market share should be counted in some way as part of Intel's, too. Also, Intel's strength is in chip development and likely doesn't want the thin margins found in the box maker's market.