The dictionary sounds like bullshit. North Korean and South Korean are completely different dialects, with different orthography and spelling. Bigger differences than different spellings in English. I can't see a dictionary like that being of any use to his family.
There is no way sources can ever be checked, and that means anywhere from 0 to 100% of the article could be fabricated.
(edit: an analogy to better describe the dubious usefulness of the dictionary, it would be like a native Greek using a French-English dictionary to learn English)