RCT C. Lee,
I believe that method is indeed outdated. All you need to do now is just drag the @task_force_radio folder into your ARMA 3 directory, then open it up, go to the "teamspeak" folder and there should be a Teamspeak 3 plugin file (task_force_radio.ts3_plugin). Double click that and install it. You can verify your installation by connecting to the 506th TS and clicking on yourself. In the right side panel it should say "Task Force Radio Status (1.-1.0.249):" followed by some additional info. If you see this then you've installed the plugin correctly. Let me know if you need anything else
Regards,
SrA Minatozaki