"Autocomplete" in this case is a bit fuzzy (the behaviour will be most familiar to people used to using command shells like Bash or Zsh, etc). Pressing <Tab> will show you all the possible completions from the letters you've already typed, completing it automatically if there is only one option. So when you press <Tab> without typing anything you''re getting all the possible commands. It's just unfortunate that the first two are "get" and "help", so hitting <Tab> makes it look like the output is "Get help...".
G, S, H, C, P, R, and W will each give you a couple of possible completions and need an extra letter before they are unique so they can autocomplete.