The big secret is: how much have the chinese advance in terms of aircraft carriers knowledge? the chinese must fear that those journalists could have noticed/spotted something that they dont want to reveal.
yes, the US has already been there and knows much more than china, but the US would surely like to know how much have they advanced. Thats why the whole USS cowpens incident.
Honestly I doubt they were afraid of journalists harping on about that because we can be sure the outlets that would make those claims would still make those claims with or without proof.
I think you are reading too much into this. The PLA is still relatively closed to open media and the liaoning is still their first aircraft carrier. Not wanting media onboard makes me think it was a decision made out of habit rather than any fear of journalists seeing some stuff they can write home about.
It isn't like china cares that much about what news journalists "criticize" about the "quality" of its weapons anyway, so Icant imagine they'd oppose foreign media for that reason.
Hell we can bet Hagel knows more about carrier design than any I the journalists that could have been invited, and is in a much better position to speak about it as well.
So way to make a mountain out of a molehill guys.