+xsounds like an overstatement

Not really.
But as Tim said, it is not an aeronautical data.
Some years ago the LPO (a association who protect the birds) was willing to prohibited the flights and at the same time they refused to communicate the aeras were the birds has nested. In order to avoid that hunters goes there to make some trophy.
Since if they want to avoid the flights, they accepted to communicate the approximative location, but not communicate if it is active or not. By the way we have this 10 years long period for each nest that existed a single time.
The fact is that it is not prohibited to fly over, but it is forbidden to disturb the birds, in case there were any at that place.
In the first years, I found that cool, but later I understand that this guys are some kind of extremist who mainly hate planes. End of the story.