No. The story is what the evidence supports. He had Snowden and plenty of credible evidence when he broke that story. He claims he had to leave because of intolerable political bias and censorship, The Intercept says it was because he wanted to publish claims that were not supported by the current evidence. If I understand correctly, Greenwald himself doesn't dispute that he doesn't have access to the files in question and therefore can't have substantiated anything in his article beyond what is already publicly known, which is very little.

Greenwald may be a great journalist but that doesn't mean his word is now taken on faith alone.