Haven’t taken apart any D-A hubs.
But the general approach for Shimano freehub bodies is to pull the axle. Then there is a hollow-core Allen type of bolt which the axle runs through that holds the f/h to the hub. Usually - but not always - it’s loosened from the DS. Regular thread.
The rings with the holes should be a dust shield, and spin with the splined shell of the f/h body. Try holding the splined shell steady and turn the ring in the marked direction if you need to get it out.
Last edited by dabac; 12-20-19 at 12:48 AM.