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Re:LK-99 isn’t a superconductor – how science sleuths solved... by lolinder on Wednesday August 16, 2023 @01:19PM (#37150330)
It looks like he doesn't specialize exclusively in copper sulfide. His most cited works are to do with gold, and he has articles on a bunch of different materials:

https://scholar.google.com/citations?user=7WQhABIAAAAJ&hl=en...

Re:LK-99 isn’t a superconductor – how science sleuths solved... by deaddodo on Wednesday August 16, 2023 @01:47PM (#37150827)
Yeah, OP seems to be confusing expert knowledge in a field with exclusive knowledge in a field.