I'm not 100% sure of Voice Commander's capability, but I don't think it allows for you to dictate a chat message. You also have to edit the commands in a text file with it, where mine has a simple UI for editing commands.

I'm guessing from his documentation that he's using the method of simulating keystrokes that will get picked up by keyclone. My current version does not, but I plan to allow the option to switch methods in my next release, since my method is quicker and more reliable for entering more than a single key press. I do already have a means to broadcast to all instances on the local machine, just not over the network.