The 2006 test, while low magnitude, was a legitimate test; fission products were detected.
The larger 2009 test was well sealed, but at 2-6 kilotons it would be a truly enormous amount of conventional explosives; there’s no evidence it wasn’t a real test.
One of the difficulties in making nuclear weapons is keeping them from blowing themselves apart prematurely. I’ve always suspected that that’s where they failed.
“quake” collocated at the Punggye-ri Test Facility (41.278, 129.087) . It was a test!!!!!!!!!!!!!