He could not have OPT in 2012 (it requires a year of study), when this form had been faxed. He states as much, mentioning that his life was different "During the first year in the U.S." right before telling about this job.
So the best skeptical take is that he went to work illegally, was given I-9 and did not fill it because there was no box for his status at the time "alien, not authorized to work". Then the employer, who is hiring illegals and is not exactly straight edge either, filled it for him. This does not make much sense, though, since it would not matter for the employer without the section 2 of the form, which lists documents proving the eligibility for work.
He still broke the law but, maybe, not to the degree where he earned a ban from the U.S. This depends on how long he worked illegally.
