We haven't moved anywhere, because it's not speech that's illegal, it's the intention to do harm. You could perfectly well communicate your intentions to do harm with no speech at all, e.g. by pointing a gun to a bank teller without saying a word. If you use speech to offer to sell drugs to somebody, and a cop arrests you for it, that's not an issue of free speech, that's an issue of drug dealing.
The fact that you aren't allowed to commit crimes by using your speech doesn't make free speech itself a paradox - otherwise any use of the word "free" in the context of humans in society might as well be paradoxical. "We're not free to commit a murder, therefore individual freedom is a paradox" - that'd be quite a naive take on the matter.
In case of free speech as an ideal, it's still a bullshit argument. You cannot suppress speech with speech alone. Go on any anonymous internet forum and try to suppress someone's speech by e.g. threatening to doxx/harm them - you will be laughed at, because on the internet there is no real threat of harm. It's always the threat of harm that actually suppresses speech, not speech itself.
That fact that you use speech to deliver the threat doesn't in itself create a paradox.
In context of freedom of movement, that argument would be akin to "free movement is a paradox because you can suppress someone's movement by holding them down". Yes, you use free movement to walk up to a person, but it's not your movement that holds them down.