I’m really not sure why it’s not working for you. My guess is that the Google Software Update no longer includes those scripts and these commands are now outdated. This post was written back in 2008, so I’m not surprised that the commands no longer work. I don’t use Google Talk and since doing a clean install of OS X 10.10 (Yosemite) I haven’t had any issue with Google Software Update (i.e., I’ve never seen it run).
Like you, I also use Little Snitch to block any outgoing connections that I don’t want going out, so I’d say that’s probably your best bet. Otherwise, you may find other info on the web that is a bit more current. Good luck!