Alright so if I understand this well: Haiti under the French colonial rule did not have slavery during the times when the imported slave population exceeded some limit when compared to the French population there.

I will continue with a hypothetical: if for example more French came on a trip there and the not slaves would become a minority, there would all of a sudden be slavery there. And of course when they would depart from their holidays, Haiti would again gracefully abandon that heinous practice.