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The researchers addressed the criticism wrt diamagnetic properties:

“Kim says that this is due to the sample being imperfect which means that only some part of it becomes superconductive and exhibits the Meissner effect”

https://archive.is/Lve8I

That doesn't sound like they addressed the criticism.
It’s an “address”, just not a compelling one
Being skeptical isn't interesting. We want to know if the results are repeatable.
>Material name is LK99

Slightly off topic but somehow reminded me of E99 material from the game Singularity [1]. On topic though, it would be interesting to have that material to build a levitating drone, no props, no brushless motors, and most importantly, no power needed!

[1] https://www.giantbomb.com/singularity/3030-21144/