Buzzfeed does have a general reputation for accuracy; their not a propaganda outlet.

I'm fine with raising questions, but we can question everything on that level - nothing is certain. Long, involved scientific studies still have enough flaws and uncertainties to fill many HN threads. Some uncertainty doesn't wipe out all credibility.

Anonymous sources are essential to critical public information; Woodward and Bernstein never revealed their source - should the Washington Post never have published the articles?

I’m going to guess that they weren’t.

That statement has less credibility than the article's, though at least it's acknowledged that it's a guess.