I'm assuming it's satire referring to those required job postings that are intended to single out a specific H1-B candidate but need to be posted anyways to satisfy the "we looked for an American and couldn't find one" requirement. They typically have very specific requirements that match the exact skillset of the intended hire to ensure that any American applying will be lacking in some required "qualification," even if it's "only has experience with software w.x.y and we require w.x.z."

Note: I'm not saying all or even most H1-Bs are hired this way, just that the scummy companies that abuse the program tend to post these kinds of job ads.