It depends on what you mean by "list". Anyone can list a property on sites like Trulia and Zillow for free. However, if you want the property to be listed on the MLS, you need to hire an licensed real estate agent, who may or may not be a Realtor.
The comment was that real estate agents would *prefer* the house be empty. That's not BS. No, it's not always possible, but it's not uncommon. As an example, in Las Vegas as of 7/31/21 there were 4338 properties listed on the MLS system.
1635 are vacant. That's over 1/3.According to the agents I know, It's easier for a buyer to envision their own furniture in an empty house. Minimal staging can help with scale, but staging is apparently becoming less and less common, at least according to my sources in the business.