The act of removing a pin means that you are now in possession of a magazine that can hold more than the legal number of rounds, so you would be committing a criminal offence if you removed a pin. Why do we need to create a new offence for something that's already illegal? It's like saying it's illegal to murder somebody, but we're making a new act to say it's illegal to commit the act of murdering somebody.
On October 4th, 2022. See this statement in context.