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That TRRS connector is setup that way so that the BBA can be plugged into the controller all the time and the controller doesn't think that a headset has been plugged in. That is that split ring stays open if just the BBA is plugged in, so the controller ignores the headset port.
The plot thickens. https://www.aliexpress.com/item/1005001682158341.htmlAlmost skipped over it but i noticed it uses the EXT port communication to communicate, and is quite a bit cheaper than the original units. Morbidly curious so i ordered one but I don't have the tools to actually dissect the protocol or dump firmware. Interesting to see a design not trying to blatantly copy the original.
I wasted my money so you don't have to and ordered one of the cheaper china ones just to take a look inside. I have to say you get what you pay for. Only partial advantage of this over the original units is this includes rapidfire OOB and is cheaper, but you really get what you pay for.