[hyperpape]

That doesn't seem plausible. He could non-specifically say "don't use Windows. Ideally use [some stock linux distro] or investigate other unix operating systems that can be configured for safety." That wouldn't really give away anything.

[aliakbarkhan]

It's not about giving things away -- it's about delaying your adversary. If the NSA takes Schneier at his word and targets him accordingly, then (assuming this is a diversionary tactic) any 0days or other attacks they attempt to send his way will fail. Now obviously that's not a long-term strategy, but it does provide an extra layer of protection against naïve attacks based on his public statements. To be clear, I'm not sure I buy the smokescreen idea, either, but your reason for disbelieving is flawed.

[hyperpape]

It's fair that this would make some difference. But it's not as "he's not on Windows, but we have no clue what he is on?" is a recipe for quick success. He doesn't have to say what linux distro he uses, just give a placeholder for a decent one, and he doesn't even have to use Linux.

In any case, is it worth potentially misleading a lot of people for the sake of such a marginal increase in his own security? He could have an even more secure setup if he didn't talk about instituting an air gap. He's already giving away information.