To be honest it does sound rather unpleasant way of cultivating coffee beans, but it does taste rather nice (only ever had it once - can't afford it daily...Nescafe Gold Blend will do me!!)
You've really tasted it? Good effort!
I guess honey is regurgitated nectar when you think about it. And coffee is roasted so that will kill off any bugs.
Thinking t through, many foods require fermentation of some sort before consumption to improve the flavour - like chocolate. So, digestion probably has similar effects. Probably tastes better than it sounds!