All I know is that it is not deuterium fusion, making your claim of a core temperature in the millions of Celsius speculative and unsubstantiated. Unless you have new ground to break, this conversation is at a dead end.
The answer coming from this thread is that "it's a mystery in Astronomy." Exactly my point. This star cannot be explained by Astronomy, and so some new mystery power source needs to be created to explain it.
Tom, you make it sound like we are all astronomers here, and can definitively say that there is no answer in science at this time. Are you an astronomer? I am not. But a very quick search on the intrawebs showed that there are lots and lots of papers on the workings of Brown Dwarfs. They require payment and this is your bone to pick, so why dont you pony up? You might find the answer you are not looking for.
Setting that aside and indulging your "argument" hypothetically, you are saying that because there is no answer now that there never will be? If that is the horse you want to bet on, be my guest, but historically, the odds are against you.