I don’t disagree with that but the article is talking about what arguments are permissible in a court room which is a little different. Same as using tools to commit a crime. It’s not illegal to own or use tools but when used in commission of a crime, this can be a factor in proving elements of a crime that require proof of intention or malice.
Thats why it would have to be a closed system with controlled transmissions rather than omnidirectional radio transmissions.