I think you may be confusing this fragment with another one. The one the article is referring to wasn't excavated until 2007.

Archaeologist Eli Shukron and University of Haifa professor Gershon Galil have made headlines with their announcement of a fragmentary monumental inscription that they believe mentions the biblical King Hezekiah. According to the researchers, the fragment, which was excavated in 2007 from the City of David by Shukron and Ronny Reich, contains two lines of writing, each with just a few letters written in Old Hebrew script.

@KeithThroop What will really be exciting is when they dig up enough of the king's original inscription that they can piece it together in total.