This statement is false and should be corrected.
North Korea "shuttered" Yongbyon as a result of negotiations in 1994-2003, 2007-2009 and offered to do so again in 2012.
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"More recently, North Korea raised the stakes drastically by reopening a nuclear complex in Yongbyon that had been shuttered under a 1994 agreement..."
nytimes.com/2003/01/03/int…
"The hard-won nuclear deal with North Korea seems to be unraveling after a hopeful period in which the North shuttered its nuclear reactor at Yongbyon and dramatically blew up the cooling tower."
nytimes.com/2008/09/29/opi…