Except Musk was never ever for absolute free speech. Also, the free speech absolutists have it wrong. Read speechless: controlling words, controlling minds for a much better and more coherent conservative philosophy on free speech.
Absolute free speech is an illusion that has never existed and never will. Our problem in society is that that we censor the wrong kinds of speech and tolerate the wrong kinds of speech. Overton windows aren't bad. Ours has just been corrupted. Musk explicitly said he wants to essentially broaden and fix the tolerance window, not abolish it.