[cassandratt]

"Battle tested" typically means that the code has been running for a long time, bugs found, bugs squashed, and a stability has been attained for a long time. It's usage predates the "information wars", back when we really didn't think about security that much because nothing was connected to anything else that went outside the companies, so there were no hackers or security battles back then. So I suspect this is the authors frame of reference.