That does sometimes intentionally happen if the company has a specific visa candidate or internal employee selected for the position but is required to post a p

That does sometimes intentionally happen if the company has a specific visa candidate or internal employee selected for the position but is required to post a public facing position - that's also where you'll see extremely specific and unrelated tech requirements like "15 years web development, 5 years embedded system driver development, maintainer of at least two major open source projects".