How do I shut off bluetooth completely in Linux Mint 21.2?

Linux Mint 21.2 Cinnamon.

I am using powertop to view what is using my laptop battery the most and it seems the bluetooth adaptop is using around 5W. I turned BT off in settings and also in /etc/bluetooth i changed the config file main.conf to not autostart bluetooth.
Even after doing this and a couple restarts, powertop still shows BT using 3-5W power.

pasocon@pasocon:~$ sudo systemctl status bluetooth
[sudo] password for pasocon:
● bluetooth.service - Bluetooth service
Loaded: loaded (/lib/systemd/system/bluetooth.service; enabled; vendor preset: enabled)
Active: active (running) since Fri 2023-07-28 13:09:10 IST; 1h 0min ago
Docs: man:bluetoothd(8)
Main PID: 792 (bluetoothd)
Status: "Running"
Tasks: 1 (limit: 18691)
Memory: 1.9M
CPU: 26ms
CGroup: /system.slice/bluetooth.service
└─792 /usr/lib/bluetooth/bluetoothd

Jul 28 13:09:13 pasocon bluetoothd[792]: Endpoint registered: sender=:1.33 path=/MediaEndpoint/A2DPSink/ap>
Jul 28 13:09:13 pasocon bluetoothd[792]: Endpoint registered: sender=:1.33 path=/MediaEndpoint/A2DPSource/>
Jul 28 13:09:13 pasocon bluetoothd[792]: Endpoint registered: sender=:1.33 path=/MediaEndpoint/A2DPSink/sbc
Jul 28 13:09:13 pasocon bluetoothd[792]: Endpoint registered: sender=:1.33 path=/MediaEndpoint/A2DPSource/>
Jul 28 13:09:13 pasocon bluetoothd[792]: Endpoint registered: sender=:1.33 path=/MediaEndpoint/A2DPSink/sb>
Jul 28 13:09:13 pasocon bluetoothd[792]: Endpoint registered: sender=:1.33 path=/MediaEndpoint/A2DPSource/>
Jul 28 13:09:13 pasocon bluetoothd[792]: Endpoint registered: sender=:1.33 path=/MediaEndpoint/A2DPSink/sb>
Jul 28 13:09:13 pasocon bluetoothd[792]: Endpoint registered: sender=:1.33 path=/MediaEndpoint/A2DPSource/>
Jul 28 13:09:13 pasocon bluetoothd[792]: Endpoint registered: sender=:1.33 path=/MediaEndpoint/A2DPSink/sb>
Jul 28 13:09:13 pasocon bluetoothd[792]: Endpoint registered: sender=:1.33 path=/MediaEndpoint/A2DPSource/>

pasocon@pasocon:$ rfkill list
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
1: hci0: Bluetooth
Soft blocked: no
Hard blocked: no
pasocon@pasocon:$ bluetoothctl <<< show | grep Powered
Powered: no
pasocon@pasocon:~$

I searched the bios but didnt find any option to disable the bluetooth device. The only advanced options are wrt frequencies and transmit power settings. Does this mean I cant switch off BT completely?

edit: using quotes instead of code because code doesn't work well. i havent striked out anything. the kbin editor is striking out text by itself. o.0