Moreover, the language of the claimed poet - I’m an Arab - is far different from the language of the time, far from being poetic, and the statement claimed that Prophet Muhammad said has a very different tone from his usual tone (He said “Who’d save me from Al ‘Asmaa bint Marwan?” and the Prophet himself mentioned that there is no savior other than Allah. The prophet approach would be something like يريحني (v. make me relaxed) from so and so. It’s a very horrible and easy to spot fabrication, the fabricator almost didn’t put any effort in it and used the language of his time instead.
You don’t need to mention a fabricated story to attack Islam’s take on free speech. Free speech is simply not a principle that was ever well-regarded in Islam. “Whomever believes in Allah and the last day should only say good or be quiet” and “Are people thrown into the depth of hellfire except by the sowing of their tongues” and “It is enough for one to be described as a liar is to talk about everything he heard”. The notion of “freedom” is a very western notion that - in its current form - very alien to the sort of freedom that Islam talks about: minimal freedom that is constrained by rules. Free speech certainly isn’t regarded as part of that minimal freedom. More like “constrained speech”, because of the inherent Islamic belief that free speech brings chaos. In times of Fitnah (tribulation, calamity) people are commanded by the Prophet not to speak a word: “Hold your tongue, stay at your home, and abandon the matters of public”; which is absolutely against free speech because people’s opinions are stirred most when there are events, and they’re commanded to be quiet and bottle it in.
It is just that we, Arabs, are a radically different culture that values stability and tradition. Something of the sort of “People should mind their own business”. Free speech undermines both. It’s a significant cultural difference that the west has no intent to respect, because they regard it as oppressive.
You don’t need to mention a fabricated story to highlight that.