He _literally_ guesses that other journalist will receive the same personal briefing he gets.
Gruber TOLD us what is "different" now; what's different, clearly, is that journalists are being given briefings like this to spread the word in advance about OS changes.
You fell for his writing. "This is an awful lot of effort and attention in order to brief what I’m guessing is a list of a dozen or two writers and journalists." He never asked the question "How many other people will get this private presentation?" or anything equally basic.
An Apple VP specifically targeted Gruber's fanclub. He's a trustworthy sycophant.