Well, if you place a warrant canary, and then receive an NSL, the warrant canary must be modified, as that is its sole purpose. If you leave the warrant canary in tact, then you've lied. The act of changing the warrant canary will by definition violate the (secrecy) terms of the NSL and possibly invoke gov't reprisal. Even without the warrant canary the terms of an NSL may compel an individual to lie through coercion, depending upon circumstance.

I didn't say that the NSL compels each recipient to lie, in every case. I said the gov't can and does compel individuals to lie. That's not a "fictitious belief" it's a fact. Then I offered a concrete example of widespread gov't conduct supporting that claim.

If you keep waiting to see it spelled out in black and white, "Be it ordered on this day the NSA under the authorization of Congress and President Obama (with all their signatures) that you shall go on the Today Show and Charlie Rose's show and tell everyone that we can't read everyone's email and that we're all a great bunch of guys." you're likely to have to wait a while. You're being obtuse and I think you know that. It probably works well in other areas of your life, but it makes you ill-suited to make judgments about non-trivial issues because it is rare that all relevant facts become obvious as an atomic operation.