The article is about Scott, as a person who runs a popular blog. The source is named "Scott Alexander". There is no need to publish his personal information. If the NYT wants to verify that he is actually a practicing psychiatrist etc, then they can gather that information, do the legwork, publish the information ("NYT can confirm that SA is who he says he is"), without jeopardizing that practice.
The article is about Scott, as a person who runs a popular blog. The source is named "Scott Alexander". There is no need to publish his personal information. If the NYT wants to verify that he is actually a practicing psychiatrist etc, then they can gather that information, do the legwork, publish the information ("NYT can confirm that SA is who he says he is"), without jeopardizing that practice.