CEOs of big public companies lie to their shareholders all the time. It would be fantastic if they could be held accountable for those lies, but AFAIK when the SEC has tried, they always weasel out of it by saying things like "well, from what I knew at the time, it was true" or "if you interpret it this (ridiculous) way it was true". It's very, very hard to prove malicious intent—that is, prove what was going on in the CEO's head when they said it—with something like this beyond doubt, and that's effectively what's required.