In this case it appears that the propulsion/lift fan is being used to draw cooling air through the engine. My tired old eyes seem to see a lack of ducting to the cylinders which would have the same effect as it would inside an unbaffled cowl. There may well be something that is attached to an outer shroud that is not noted in the pictures that would better direct the flow around the cylinders.

A little heads up for designs like this. They are not very efficient and a very large amount of available power is used up in the lifting required to move the airframe and required fuel. It doesn't leave much available for payload purposes.