lol.
Anyway, compromising the Bluetooth system module is possible. The OP's thing is 1000% fake ("add the jailbreak script? as then the switch would run anything the microcontroller says as it will be known as an admin" is enormously fake gibberish clearly indicating they don't understand how this works). Not surprising given they're a noob and they're not familiar with low level programming. Either way, there actually are other (real) bluetooth module flaws.
The problem is, this is useless. Compromising the bluetooth module does nothing for you in terms of homebrew capabilities; the module is not especially privileged and does not have access to any useful services for further escalation. And of course the kernel continues to have no security bugs.
The Switch isn't like the Wii U or Wii -- there, if you compromised the bluetooth stack, you had all the privileges you needed. Here, you get jack shit.
It's your prerogative to choose to waste your time on something like this, OP, but I'd like to be clear to any onlookers this is a fool's errand and you would, in fact, be wasting your time.