Canned by the company yes, not canned by the government.
https://twitter.com/_jameshatfield_/status/11001772987230945...
The point of the SEC is to prevent harms like that. The point of the SEC's 2018 settlement with Elon was to prevent him from investor-harming tweets like the one he made by requiring tweets about Tesla to be reviewed for accuracy and correctness before posting.
Does it matter that it was outside of trading hours?
A lot of people don't realize this is industry-standard. Any reasonable CEO wants to make sure they aren't inadvertently committing securities fraud with the send of a tweet.
Tweets being reviewed by the legal department are par for the course at any publicly-traded company.