They're talking about 2003-2006 when AMD had a superior product. The allegation is that Intel pressured OEMs into purchasing only Intel products.
I distinctly recall reading an article (on Anandtech, I believe) where Taiwan MB makers were unwilling to jump on A64s, because Intel had told them they would get fewer chipsets if they did.
For the period in question, I 100% believe was guilty of very shady practices that were similar to MS's practices in the 90's.
I like Intel's current CPU lineup, but that doesn't wash away their sins.
With that said, it's no clear that AMD would be in much better shape. I guess it'd really depend on whether or not they would have done a better job of transitioning off of A64.