Despite the error message, the NVRAM has been cleared. Found this on another forum that proves it out:
Cyberdevss-iMac:~ cyberdevs$ sudo nvram TestVar=HelloWorld
Cyberdevss-iMac:~ cyberdevs$ sudo nvram -p | grep 'TestVar'
TestVar HelloWorld
Cyberdevss-iMac:~ cyberdevs$ sudo nvram -c
nvram...
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