If what Elon Musk says is true, i.e. that SEC account X was not hacked, then this is indeed ultra-serious and means that someone working within the SEC and with access to SEC account X did so probably for personal gain.
As you explain, the SEC chairman should be fired for incompetence!
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Plot twist: is was Elon Musk that hacked the SEC account :o
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If what Elon Musk says is true
citation needed