Did the Father Fortea write a TREATY or did he write a TREATSIE? Big difference. A treatise is an extensive writing about a particular topic. a treaty is a negotiated agreement between two or more parties.
Obviously, it was not a treaty...but neither was it a treatise. I’d blame journalistic malpractice for this one.
That said, this is a very important work. The church has allowed all of these voodoo movements to flourish way too long. They are destructive, evil and destroy people’s lives. I read that there are priests in the cartel areas doing exorcisms of gang members devoted to la Santa Muerte. That’s the only thing that will stop this evil.