You are downloading arbitrary code from a GitHub repository or a random Discord server. Many "Fake Deafen" plugins have been discovered to contain:
Before we discuss faking it, we must understand the real feature. Discord’s "Deafen" (the headphone icon) does two things simultaneously: discord fake deafen plugin
Third-party mods break every time Discord updates (which is approximately every 1–2 weeks). A plugin that works today can cause your entire Discord client to crash, fail to connect to voice, or infinitely loop the "Connecting" screen tomorrow. You are downloading arbitrary code from a GitHub