All security is through obscurity. If somebody knows your key, or your hiding spot, or what time you have to put down your shotgun to take a crap, you're through. All cryptography does is let you protect a large secret with a smaller one.
What you say is true, but it doesn't really address security through obscurity. Yes, all information security is carried out through some form of literal obscurity, but the phrase "security through obscurity" is a piece of jargon that involves keeping the security system hidden. In other words, some security engineer has Idea A that can be used to protect Secret B, but only if A remains secret as well. That's bad.
Avoiding security through obscurity means drawing a clear box around the information you intend to obscure—that is, the key—and saying with confidence, "Nothing other than this needs to remain secret."
But then, the flu studies are the informational content, not the key nor a system used to keep that content secret, so security through obscurity really has little to nothing to do with this thread.