Flashing the phone’s bootloader and image is still done with adb and fastboot, but unlocking the bootloader is by now pretty much done with tools only made for windows.
Mostly this is because the exploits use factory flashing tools provided by manufacturers, which are nearly always windows.
Did you read my comment?
If you are referring to fastboot oem unlock, there are almost no phones that don’t have dual or even triple bootloader partitions, so that won’t work by itself.
I wouldn’t trust a chrome USB TTY permission to touch anything hardware of mine.