"Public figure" doesn't really go well with "wants to remain pseudonymous". He writes a blog as a personal hobby, he's not a celebrity or politician.
And yes, that's pretty often true about subjects of articles that do not get doxxed, because "Maria, NYC, Nurse" is enough to give you an idea about the person but far away from being enough for individual identification. And, of course, it doesn't matter for the story, just as the name doesn't matter for any profile about SSC.
Is that true of “Maria” in your example?