Because if you can't trust the source of yesterday's anonymously sourced $99 Nexus rumor to accurately report the denial of a $99 Nexus 7, who can you trust in this crazy world?
Never mind that the actual quote Digitimes has today doesn't actually refute anything. Here 'tis:
With Nexus 7's strong sales, rumor have circulated that Google is looking to push forward and will cooperate with Asustek to release a US$99 entry-level model and a US$199 ultra-thin upgraded model to counter Amazon and Apple's new tablet devices.
So, yeah. There's that. Ain't nothing official till it's official, folks.