nrf5340_audio buildprog.py: error: unrecognized arguments: -t broadcast

I followed the steps here docs.nordicsemi.com/.../building.html: PS C:\ncs\v2.9.1\nrf\applications\nrf5340_audio\tools\buildprog> python buildprog.py -c app -b debug -d gateway -t broadcast, and an error occurred: buildprog.py: error: unrecognized arguments: -t broadcast

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