Anonymously talking with the media doesn't mean they were anonymously talking with Israel
Maintaining public anonymity does not mean the press didn't know who they were, and could verify that they knew what they were talking about.
I do agree that it's useful to maintain a certain level of skepticism… but that doesn't mean complete distrust of anything you're told. It's not unreasonable that Egypt had intel that an attack like this was coming, or at the very least that extremist elements were reaching a breaking point and something extreme was going to happen soon.
Depending on how you're interpreting this:
Anonymously talking with the media doesn't mean they were anonymously talking with Israel
Maintaining public anonymity does not mean the press didn't know who they were, and could verify that they knew what they were talking about.
I do agree that it's useful to maintain a certain level of skepticism… but that doesn't mean complete distrust of anything you're told. It's not unreasonable that Egypt had intel that an attack like this was coming, or at the very least that extremist elements were reaching a breaking point and something extreme was going to happen soon.