I read it. Cool stuff.The F205 has radiation control with acoustic ports and several internal chambers, with ports inside the cabinet. There is a rendering (picture below "Technology" section) which shows some of the internal construction, without damping materials.
The purpose of those internal chambers and ports and damping material is to shape the frequency response and delay of the sound emitted from the acoustic ports. This all works together in a rather complex way, that is only possible to see properly using simulation of the acoustic system.
The cabinet with the ports and internals is one part of the design - the choice of radiation pattern is also a part of the design process. A desired pattern is defined, and then the cabinet is optimized to create this pattern, by placement and size of acoustic ports, and tuning of the internal chambers.
However, I wouldn’t call your design a horn. An acoustic horn converts large pressure changes within a small area into a low pressure changes within a large displacement area. As far as I can see that’s not how your subwoofer works. Am I correct?