No, they are negotiating, read their latest statement, it is full of “ifs.” If you are negotiating, especially in a fraught situation, often you will feel the need to walk away from the talks, or at least threaten to do so. (Of course, many people suggest Obama should have done more of this leading up to the Iran deal.) And Kim doesn’t want to enter the talks with Trump having had an unbroken string of PR successes.
Now, there is a perfectly reasonable argument for being pessimistic about the North Korean nuclear talks, namely that some of the demands of the two sides may prove incompatible. The good news, if you would call it that, is that we are not actually calling for complete denuclearization of North Korea, though nonetheless we may require more than they are willing to cede. Most of all, we want them to start acting like a normal evil government, rather than like a crazy evil government. Maybe that is too hard for Kim to pull off and still feel stable.
Still, the new news isn’t really bad news at all. It is how an evil tyrannical government negotiates. It is also how some non-evil tyrannical governments negotiate as well, not to mention non-evil, non-tyrannical governments too.