Hello,
Yes, this way of mounting a mast is correct, deck stepped.
Both of my large yachts have their masts mounted this way.
The other way is to have the mast slide down into the hull.
But, if anything goes wrong with the rigging, all of the sail forces can cause the mast to badly damage the hull.
With the mast deck stepped, if the rigging is badly damaged, the mast can just fall into the water - - no hull damage!.
There will be rigging still attached to the mast, so nothing will be lost.
There are photos of my boats on my website, any problems - - just ask !!.
John.