The exploits are patched. You need MIUI 12.0.x or older.
If the patched method fails or bricks your device, you have two choices: root redmi 9a without pc patched
Rooting the without a PC is technically possible but carries significant hurdles, specifically regarding the bootloader unlock The exploits are patched
Download the exact Fastboot ROM version currently running on your Redmi 9a. root redmi 9a without pc patched