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A Remarkable Leap in Science: The Arrival of Room-Temperature Superconductor LK-99
(www.breakingnewsstreams.com)
Arxiv is not peer reviewed. Its just a preprint server. None of this has been verified or passed the peer review process. The claims being made are far out of line with those made by other groups. i.e extremely high transition temperature under mild pressures in a dirt cheap material is suspicious on its own. The quality of the paper's writing is substandard as well (many typographical errors, paper appears to be using office software to render visual data instead of tools standard in the field, lack of editing etc.)
While it would be great if this were real, I strongly suspect that it is not just like the many similar papers before it. This isnt the first time someone has claimed room temperature superconductivity was real and every single time it turned out to be either fraud or pathological science. Good science tries to find and test alternative explanations for observations and bad science leaps to conclusions with no attempt to entertain the possibility that conclusions are wrong. A good example of the former is Rosenberg's paper on cisplatin. A good example of the latter is fleischmann and pons and their paper on supposed cold fusion.
The saying "if it sounds too good to be true, it probably is" applies here.