TBH I thought it was a well-written letter. It's open and honest about the problems the company has faced and the measures they've taken to address them, even the uglier actions like furloughs. It also goes into a good amount of detail with what's happening behind the scenes (the animal care section in particular was really nice).
I also doubt that most companies' CEOs actually write the letters made out by them- just look at how KD's letter is addressed from their GM, Tony Johnson, even though ever other CF park's GM put out the exact same message. One thing that actually stood out to me in this letter was that its wording seemed more straightforward and less wordy than the marketing spin you usually see; maybe it really did come from the CEO, or at least someone else with authority who just wanted to get the info out there to the park's guests.