You're fine dude. My mule has been on for 2 years and I haven't used a proxy on it or taken any precautions. RWT bans are rare and usually only happen if you are trading large sums oftenly.
No references are given to back up your claim. One could just assume that you get banned for the opposite reason, where your bot has a lot of flaws and keeps making mistakes like getting stuck doing something repeatedly and that gets you banned.