I just ran into this issue as well. The problem for me was that the bash script tries to run fastboot but if you don’t add fastboot and adb to your path, the script will error and tell you that your phone is still locked. TBH very weird that the script doesn’t check if fastboot is availabe.
To fix the script, run export PATH="$<path-to-platform-tools>/platform-tools:$PATH" so that the bash script can actually find fastboot. (Obviously replace <path-to-platform-tools> with the actual path)