

TLDR:
They found debugging commands that can be used to access the memory of the device over USB. This is as much a backdoor as any device that runs unsigned firmware
Unless you store secret files on your Bluetooth dongle, you shouldn’t have to worry about this.
Block user/community/instance.
Report if advocating for violence.
There’s really isn’t enough time to argue with everyone, and these people are probably used to being argued with, and might even take it as evidence of some big conspiracy. – If you want to make changes in the word, there are more productive ways then arguing on obscure forums.