This is the difference between British law and American law. People often get confused with the definition of free speech since in America it refers to the 1st amendment which only applies to censorship by the government. Britain actually does allow the government to censor speech.
The article does give insight into the Brit's definition of free speech. In America private companies can moderate their own platform since they are also liable for that platform. It is a thin line between the two.
I am not sure which I prefer but I notice I get spooked when government gets involved in free speech.
Amendment I Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof; or abridging the freedom of speech, or of the press; or the right of the people peaceably to assemble, and to petition the Government for a redress of grievances.