True, although I'm betting the local phone companies' distribution model more accurately fits the traditional definition of "the Yellow Pages". When people think "Yellow Pages" they think of a free telephone directory distributed to all residences and businesses in the area being advertised in.

According to the complaint, United Directories published 27,626 copies of the book in 2009. Exhibit A of the complaint is an advertisement they sent to a small business in North Las Vegas for the "National Business Edition" of the "Yellow Pages". I don't see how, with 27,626 copies printed, the United Directories' Yellow Pages could possibly meet the traditional definition of "the Yellow Pages" in a "National Business Edition".

So yes, while probably not illegal, its deceptive to use the term "Yellow Pages" when you're just publishing a lower circulation business to business directory.