No, it does not unlock the bootloader directly. It can relock it or flash signed images without unlocking.
Xiaomi implements an Anti-Rollback mechanism on many newer devices. ARB prevents the installation of older firmware versions to thwart downgrade attacks that exploit older security vulnerabilities. Xiaomi Authorized Flash Tool 6.1.1 Download
Public sources (use at your own risk):
Users must be aware that using this tool carries significant risks. Flashing the wrong firmware or a sudden disconnection can lead to a permanent hardware brick. Furthermore, because Xiaomi has tightened security, standard Mi accounts often cannot authorize EDL flashes, requiring access to official service center credentials. 6. Conclusion No, it does not unlock the bootloader directly