No - we don't really enforce NDA directly so that's generally not a good reason to flag anything. Also, as Daniel explained in a comment - the language itself is documented publicly in an iBook without any NDA required to learn the syntax. Similarly, all of Cocoa with the exception of pre-release API and changes are all available on http://developer.apple....
Closed questions can be put into the reopen queue by
users requesting a reopen by clicking the "reopen" label beneath the question (requires >3000 reputation)
users editing a closed question (e.g. to improve issues pointed out in comments, add some details etc.)
moderators after question got flagged by a <3000 rep user
The "reopen" queue works the same ...
The prescribed response is to flag it for closure for being about pre-release software and/or hardware.
And you can point them to: Can I downgrade to Mavericks after installing Yosemite (beta/developer preview)?