on the contrary, they have been building their list(s) since about 1950, and here is rule 5, regarding pronunciation:

5. Words shall be pronounced according to the diacritical markings in Webster's Third New International Dictionary [W3] and its Addenda Section, copyright 2002, Merriam-Webster, from which the pronouncer shall select the definition or definitions that he provides.

hence, one could infer that every word on their list is also to be found in W3..