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Donut Lab's miracle battery found to be a fraud, investigation claims
(interestingengineering.com)
This is a most excellent place for technology news and articles.
Yes, if they supplied batteries to independent testers, that would quickly prove their technically claims are true or false.
But the hole they've dug isn't just about technical claims. As I said, they've relied on dodgy marketing tactics which has caused industry damage, and that wouldn't just disappear. They'd still have huge business reputation issues regarding things like trust for starters. Businesses are far more than just their technology. Plenty of great tech has failed due to other factors and execution.
I hold that If their claims were true, any sketchy marketing would be forgiven very, very quickly.