Careful — nothing has yet been done towards denuclearization except a non-committing promise by Kim to halt further tests for now. The regime has made similar promises several times over the past 25 years.
There are so many worthy recipients of the Nobel Peace Prize that are virtually unknown outside their specific non-profit niches — focus on those instead, and use the prize to highlight their work.
In general, that is what makes half of foreign policy reporting semi-useless, newspapers rarely report in which sense diplomats use the words. (Compare "fighting terrorist" as claimed by everybody, in general terrorist is just defined by threatening the interests of the speaker.)
[1] Likely meaning a mutual, synchronous and long term reduction of nuclear weapons towards a global zero goal. (Like the stated US nuclear policy of the Obama administration.)
[2] Meaning a prompt and unilateral abolishment of the NK nuclear program, as in Libya.