Huge: very large in size, quantity, or extent.
Synonyms: vast, immense, gigantic, very big, great, giant, massive, colossal
You could be correct by saying it's "...larger than the average home." However, the article uses the word "huge". I don't believe that adding a walk-in closet to an average sized home constitutes a "huge" home.
You may also want to look closer at the document you referenced. The average sized home for the NORTH EAST (where this supposedly huge house is located) is 2613 square feet.
2400 is less than 2613
According to your reference material, a 2400 square foot home is neither huge nor larger than the average home based on its location.