The Lie of a Haitian "pact"

Can anyone find primary historical texts or sources that can refute this Haitian author's claim that the purported pact with the devil is gossip and slander spread via credulous people? I applaud his reference to 1 Thessalonians 5:20-22 - "Do not despise the words of the prophets, but test everything; hold fast to what is good; refrain from every form of evil." That includes refraining from passing on unsubstantiated gossip, folks!

In the meantime, let us heed the words of the prophet Isaiah in 1:16-17:

Wash yourselves; make yourselves clean
remove the evil of your doings
from before my eyes;
cease to do evil,
learn to do good,
seek justice,
rescue the oppressed,
defend the orphan,
plead for the widow.

Article: God, Satan, and the Birth of Haiti

Check out Larry's post, too, which goes more into detail of what really IS demonic in this worldly order -- the oppression of the poor, and the ghastly disparities in wealth, power and privilege.