That step was left out of the instructions. To be able to boot off the external drive you have to authenticate as an administrator. (My 2019 MacBook Pro among them) On those units, the T2 controls the ability to boot from an external drive. I am not sure the process in the article works with any of the T2 security chip Macs. (Thanks to Angus for the new Terminal command!) When you hear the boot tone, hold down the Option (⌥) key and follow the three steps above. To install Catalina on another Mac, first make sure it's powered off, then simply plug in the USB installer you created and turn the Mac on.
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