A high-speed U-boat between wartime submarines and postwar SSKs

Should the high-speed U-boat be classified as a postwar-style SSK?

It occupies a transitional position between wartime submarines and the postwar SSK concept.

The high-speed U-boat occupies a transitional position between the submarines that provided most wartime service and the SSKs understood after the Second World War. Its classification falls between the wartime and postwar categories.