That would seem to conflict with his statement that I have not provided any information that would harm our people - agent or not - and I have no intention to d

That would seem to conflict with his statement that I have not provided any information that would harm our people - agent or not - and I have no intention to do so. If Der Spiegel (or the Guardian, or the Washington Post) was less rigorous, then information could have been published that harmed "our people" or intelligence agents. He is positioning himself as having carefully reviewed everything he has given out, but if he has given info to some media sources who themselves have been "rigorous" enough and realized the danger of publishing some of it, then the statement in this letter cannot also be true.