If I recall correctly, a high tail horizontal stabilizer makes recovering from a stall very challenging. As I can understand it, the wings prevent the high horizontal stabilizer from getting the air necessary for the elevators to rotate and point the nose down, which re-engages lift from the wings for stall recovery.
In a stall, there is insufficient air across the wings to create lift, so as the plane moves forward and the plane loses altitude the tops of the wings create a turbulent wash of air above and behind them, blocking the high horizontal stabilizer and elevators from “grabbing” air across the control surfaces.
My guess is that in this event, applying rudder would yaw and roll the plane, disrupt the turbulent wash across the tail and assist in recovery, but during the process, the altitude loss would be even faster than the stall. (Spitballing here)
This just my recollection and understanding.
Pilots will have to correct me where I’m in error...
Blancorilio’s YouTube channel has a good description of this condition and summary of recent related accidents. A flight test is required whenever the wing’s leading edge of this aircraft is disturbed, to ensure that proper alignment of mating surfaces has been maintained.
It is essential to never enter stall condition as entry can be rather violent, as his video of a successful test shows; even a successful early recovery will result in a few thousand feet or so of altitude loss. Once into deep stall, recovery is impossible and the aircraft will spiral down to a crash as a leaf fluttering from a tree. The flight test verifies that warning occurs well before that point.