Alternately, he is lying. It sounds crass to outright say such a thing, but it is suspiciously convenient that Arrington draws attention to himself under the pretext of having explosive information relating to a current hot story, all with mysterious unnamed sources.
It's especially amusing given how he ends the article. "I'd have said this before, but it would have hurt my bottom line, because it would have more fully informed sources of the risks they were taking."
If it means anything, a lot of people internally at Techcrunch knew about this incident as well - as did a few people outside. It's just being made public now.