You're looking at the site for the Washington Post Company, not the Washington Post newspaper (confusing, I know).

EDIT: Nope, just the newspapers. See the press release -

The transaction covers The Washington Post and other publishing businesses, including the Express newspaper, The Gazette Newspapers, Southern Maryland Newspapers, Fairfax County Times, El Tiempo Latino and Greater Washington Publishing.

Slate magazine, TheRoot.com and Foreign Policy are not part of the transaction and will remain with The Washington Post Company, as will the WaPo Labs and SocialCode businesses, the Company’s interest in Classified Ventures and certain real estate assets, including the headquarters building in downtown Washington, DC. The Washington Post Company, which also owns Kaplan, Post–Newsweek Stations and Cable ONE, will be changing its name in connection with the transaction; no new name has yet been announced