By all means, hire a buyers agent. I cannot speak to IL law, as I am neither an attny or broker in IL. I know of no state that would prohibit a licensee from representing themselves in a transaction. However, many companies have policies restricting or prohibiting a Realtor representing themselves. Our company has that policy. In every state of which I am aware, a licensee must disclose that status. I shall let an IL RE Pro confirm this to be so in IL. It seems the disclosure has been made.
The agent has a goal to sell for highest price and best terms. The agent has knowledge and resources beyond what you have to help guide the decisions he/she makes. While the agent may have high ethics and standards, you are still best serviced by having your own buyer agent. Your buyer agent will have one agenda, representing you and your best interests.
I assume, since the property is "Listed" that there is a compensation offer made for a buyers agent. In the event a licensee sells on their own, and the property is not "Listed" or there is no buyer agent co-op, it would still be worth it for you to hire your own agent, even if you pay the fee directly.
While it is possible to strike a good deal with this seller/real estate licesee, the fee paid to a buyer agent is worth the representation, if even for validation and peace of mind.