The short answer to your question is NO titles are not grammatical they are proper nouns.
Recognize a proper noun when you see one.
Nouns name people, places,
and things. Every noun can further be classified as common or proper.
A proper noun has two distinctive features: 1) it will name a specific
[usually a one-of-a-kind] item, and 2) it will begin with a capital
letter no matter where it occurs in a sentence.
The author could have just as well called his article "Fred Smith"
When I answered this question the title was
"Are English titles grammatical?", and went on to discuss the grammar of an example title. The focus of the question has changed since I answered.
EDIT: More research (I honestly expect this only interests me now but...)
Current linguistics makes a distinction between proper nouns and
proper names; but this distinction is not universally observed
By this strict distinction, because the term noun is used for a class
of single words (tree, beauty), only single-word proper names are
proper nouns: Peter and Africa are both proper names and proper nouns;
but Peter the Great and South Africa, while they are proper names, are
not proper nouns.
So some people make a distinction between proper nouns and names, but not everyone does. The name of an article is it's name, so some linguists call these proper names, others call them proper nouns.