Keep in mind that Citron Research is known for providing info for short-sellers. So it's somewhat in their interest to see the stock go down for companies they review and, in turn, suggest their readers short.

Note: they've recently been doing lots of reviews on Z

Largely true, but they've also put out Long reports, namely Blackberry recently which they highlighted about a year ago and have reiterated their positive stance, which has played out in the market. I add this not to toot their own but even out the message that although they're known for their shorts, that's not all they research and pick.