Unless the slaves happened to live at the end of the Civil War or were lucky enough to have an owner that decided to free them (highly unlikely), they weren’t freed. They were kept as slaves until they died. It’s not like they got to retire from slavery and launch their own business.

And, no, the DeSantis revisionist history doesn’t specify “slaves at the end of slavery.” It says that slaves in general benefited from “skills they learned that they were able apply for personal benefit.” This didn’t happen except perhaps in extremely rare circumstances.