The author didn't make a serious effort to obtain the email metadata. The email w/ metadata has previously been part of litigation, -- if it indicated that Adam was Satoshi it would have come up.
Adam has no reason to further fuck up Satoshi's privacy by sharing private information. But I can get how people who see no issue invading Adam's and Satoshi's privacy would have no concept as to why someone wouldn't publish it.
Adam has no reason to further fuck up Satoshi's privacy by sharing private information. But I can get how people who see no issue invading Adam's and Satoshi's privacy would have no concept as to why someone wouldn't publish it.