That paragraph is sickening. It's the feds basically telling an employer that "we know your employee is illegal but don't you dare do anything about it."
While I was still working at the Social Security Administration Headquarters in Woodlawn, Md some 20 years ago, they had a meeting at which the then Commissioner made the ruling that: “The term alien will no longer be used within the administration unless you are referring to little green men from Mars!” I really believe that they don’t want the “undocumented guest workers” who are paying into the system, as well as their employers, revealed as it would cut down on the funds coming into the Ponzi scheme.