It might be that in the UK when people say "Free Speech" they mean Bertrand Russell's definition. I give the article that leeway since I don't know. But in America when when people say "Free Speech" they mean the 1st Amendment which predated Bertrand Russell and is more common.
When two people are communicating using common words the definition of those words need to be common otherwise communication does not happen. Otherwise you are just using jargon.