Key TakeawaysShares of data center real estate investment trust Equinix Inc. tumbled Wednesday after short seller Hindenburg said it had shorted the stock because of concerns about accounting and AI.Hindenburg alleged that Equinix manipulated its accounting, had core business decay, and sold an AI "pipe dream."The short seller also said Equinix insiders made millions selling the company's shares.Equinix said it was reviewing Hindenburg's claims and wouldn't comment further until that process was completed. ...