1. Requires a common definition of spamming. If a bot is posting headlines for the NYT on their official account is that spam? A person really eagerly replying to everyone about their favorite band? Someone trying really hard to sell you their diet pills? Musk seems to think all these are equally OK (except maybe the nyt bot).
2. Musk has been sanctioned by the SEC for illegal stock manipulation based on his tweets. He argues he should be able to. Who decides?
3. What about calling a British citizen a pedofile because you're angry he didn't like your idea? In the UK that's a crime (libel laws are different than the US, and I'm certainly no expert) but simply hiding it to UK citizens doesn't actually comply with the laws. Jurisdiction isn't clear cut.
The examples I gave are reasons why a self-described "free speech absolutist" probably isn't going to be adequately equipped to tackle these issues.
Content moderation at scale - leaving out political content or opinions - requires proactive decisions that are often murky at best. And many can have consequences for the platform, especially with both sides of the American political system attacking Section 230 and seeking to hold those platforms responsible for the content of their users.