I don't think 'Do you think the British and Americans were going to publish stories about Enigma back in WW2 in the Times during the war?' is a fair comparison to what's happening now.

Given the credibility of some three letter agency, it is reasonable that people who are technically adept or otherwise have doubt over this report. Even when you just look at the report without the credibility, it still lacks so much for anyone to pinpoint the acts to Russian state. While the report itself does not claim that, the media hype is otherwise.