I'm not sure if you get anything (nutritious) back from the bacteria but from coconut oil you go medium-chain way which as far as I remember means pure ketones.
Soluble fiber which is fermented by certain gut bacteria[0][1] and product short chain fatty acids (2.5-4 kcal per gram). Those SCFA has a slew of health benefits which the article kind of alludes to but doesn't name.