For things like this, Matt Levine is insightful:
https://news.bloomberglaw.com/securities-law/matt-levines-mo...
Summary is that not only can you not say things like "lock up" or "market share", you also can't tell employees not to say those things or you'll see headlines like the posted article and have the government claiming at trial that you're trying to hide evidence. This feels kind of odd and kind of unfair.