obtaining atomic metallic hydrogen

Interestingly, they observed this in nickel oxide electrodes, not pure nickel.

World's only piece of a metal that could revolutionise technology has disappeared after catastrophic failure of diamond holding it under enormous pressure. An attempt to measure the pressure using a low-power laser went disastrously wrong with a small “click” indicating that one of the diamonds had shattered into a fine dust.

Huh? One could expect, such a findings should be fully reproducible? The preparation of new sample shouldn't be so difficult.

"I’ve never seen a diamond shatter like that. It was so powdered on the surface, it looked like baking soda or something like that,” prof. Issac Silvera said. “I didn’t believe it was diamond, it was such a fine powder."

Maybe the cold fusion did happen there...

Sure it will, but you need to repair the diamond anvil which will a while, cost money, and maybe they will be reluctant to repeat the protocol and break another diamond anvil?