Twitter doesn't have "free speech rules". There is no connection between something Elon said once and the actual moderation system. This is true even though he owns it.
(The mods seem to ban accounts that get enough reports without really reading them. If I report an account it does tend to get banned 3-4 months later even though they've already sent me an email saying they ignored my report.)
No, it's less safe for it because he fired all the lawyers protecting you from governmental consequences of speech.
The moderation didn't actually change either though. They unbanned a bunch of people once, but as I said I've gotten a fair number banned again since they can't stop themselves.
