L'Overture was admired by many in revolutionary France because of his compassion towards the former slave-owning whites and mulattos. He was incredibly forgiving and humane given the circumstances. Even the former slave-owners couldn't hate him because he consistently stuck his neck out to protect the lives of whites and mulattos.
What you reference happened in 1804. In 1803, L'Overture was arrested and exiled to France where he died later that yet. Also in 1803, Napoleon announced that he would re-introduce slavery in Haiti. The whole episode would have been avoided if Napoleon had a conscience.