Lee and Kim have been working on this stuff for a long time. They published prematurely after major falling out within their institute.

This isn't 1 experiment as the Germans seem to think. There are multiple papers, patents, etc.

The main focus of these papers has been to make huge claims and make replication very easy. They are "all in" and they want others to call.

If they were bluffing they would be heavy on results and light/secretive on how to make the stuff (trade secret, etc).

That's why there are 2x papers published within 3 hours, both with different authors, and you have one author telling New Scientist he did not approve of a paper naming him as an author.