Yes he could have. Then the insurance man would have come out. Seen the plug say sorry. You are own your on.
I have been working with generators since 1968. I can"t tell you how many times I have seen. People trying to bypass the correct way to supply power. I have walked off more than one job. Because the customer wanted me to make do with what he had. Always tell them. I do it correctly or I don"t do it.
Saw one man burn down half his house trying the plug thing. Insurance agent called me out to the site. He arrived saw where the generator was plugged into. Told the owner sorry insurance canceled,improper generator installation.
Listen to us that know. Not Billy Bob down the street. Do a correct installation or forget it.