I just have suspicions because everything just seems too perfect. I would expect a whistleblower to be some Average Joe/Jane, not some wunderkind with an amazing background and unflappable presentation. I would expect a lot more stuttering and sweating - Edward Snowden was jittery during his first several interviews and his body language just screamed uncertainty about the future.
But I digress. Just because something feels wrong doesn't mean it really is. Could just be a false-positive.