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"As we march towards the June 2nd release of Intel's Haswell processors,"
That site got engineering samples of Lynnfield and Sandy Bridge several months before launch to post benchmarks, so they have sources somewhere. While he doesn't cite a source on the June 2 launch date, once a launch date gets close enough, there are a lot of people who know but aren't allowed to say because of an NDA, which he might have just broken. Though this far out, the tech media probably doesn't have review samples yet, and likely hasn't been briefed on it, so I'm not sure where his June 2 launch date came from.