The original CNN article mentioning Isaan was published earlier this year, specifically refers to Buriram, Loei, and the Ban Chiang Archeological Site in Udon Thani.
Subsequent articles make no mention of Isaan.
17 best places to visit in 2017 - CNN.com January 6, 2017
Thursday, February 23, 2017
Sakon Nakhon remains our little secret