As I've read it, the first lead to the material was 99.

2018 They got funding to research it further,

2020 was a first attempt of publication at Nature that was retracted, further improvements were made until 22/23 were two patents were filled, then suddenly 10 days ago Kwon, one of the co-researchers jumped the gun publishing a paper with the details, on one hand fearing a leak of someone else publishing first as that was too simple to replicate, on the other hand excluding everyone else from the paper and only listing him and Lee/Kim (LK) as authors as a Nobel prize can only be shared by three people. 2.5hrs later LK published again listing other 5 authors but him.