I see a mix of terminology for Worker Misclassification.

"I am trying to determine what amount if any, the employer reported."

An Employer reports W2. It's possible this person should have been an employee, of course.

"Can the IRS provide me his wage information"

It won't be wages. You described that, already.

"based on what has been reported under his social security number?"

Your taxpayer needs to get their Tax Transcript to see what has been reported for them for 2020.