While I understand the beating my head against the wall theme, I will try one last time. Let's pretend all our...iconoclastic friend is saying is correct. What result?
The government requires the form from the employer or he will be fined. Period.
The employer can certainly continue to be fined for employing someone who does not have an I-9 on file. (Properly filled out.) However, at some point, the government will claim it is an intentional, or willful violation of the law. This will change things to a criminal action.
Can the employer claim some something-something defense to a criminal violation? Sure. Why not? We don't have much case law on knowing if it would be successful because all the employers cave long before it gets to the appellate level. If Dillion can find an employer who is willing to go to bat for him to the point of maybe spending a decade in federal prison, maybe we can test his theory. Until then, he's just one of the many in today's society looking for a job.
We do know, beyond any doubt, an employer who fires a person in accordance to federal regulations will not be subject to lawsuit no matter what the theory.