Biased based on your opinion.
I personally think this is a very big deal and I don't see anything wrong in that sentence. If you think Google is innocent, just look at the facts.
1) They had an internal memo discouraging public disclosure. 2) They only came clean with the leak after WSJ reached out for comment before the publication of a story. 3) They buried the "leak" announcement in a gigantic blog post. The blog post was meant to announce a new project, but about halfway through the middle they disclosed a data-leaking bug. I'd say the tone of the article is in response to Google's observed and recorded actions.
Yeah, I'd say the article and letter's tone is just about right.