No, I am fairly certain he means coca as in the plant from which they derive cocaine, not cocoa, from which they derive chocolate.
I have no experience with this, but I am sure that you could find at least a little something about it at lycaeum.org. If not, erowid.org would be another place to look. Both of those sites are chock full of so much information that I couldn't imagine there would be no reference to cultivation or use of unprocessed coca leaf. Hope this helps.
S-Town