Lu Xiang had to forcibly remove Nami's power module.
Although, after reading the document, this navigation robot's volume returned to a normal level and its verbal aggression significantly reduced, it kept repeating the words "Lu Xiang is a good comrade", becoming a relentless loop.
In Sector Seventeen, especially in the current environment, this isn't a blessing at all. If others heard it, it could be identified by the United Government.
To be safe, Lu Xiang put Nami inside a large box after it was completely silenced. The box was moved to his office. She entered the secret room through its concealed door, to prevent any overly curious Law Enforcers from reinstalling the power module and restarting it, allowing it to spread the rumor that "Lu Xiang is a good comrade" throughout the Law Enforcement Manor.
Indeed, the rebels are all despicable cowards.