In the context of these tools, "Remove Hot" usually refers to a Hot Fix or a high-priority bypass for Mi Cloud locks. It disables the "Find Device" service or removes the account association so the device can be used after a factory reset.
The claims to bypass this by exploiting old EDL (Emergency Download Mode) vulnerabilities or patching the bootloader checks at the engineering level. redmi note 8 aio tool unlock bootloaderremove hot
Open your chosen ADB tool. It will list all installed packages. In the context of these tools, "Remove Hot"