I don't know if Scarlet works everywhere in the Resort but it does work perfectly in Building 3, on top of the hill.
Remember that Scarlet charges $60 for 1 week which is kinda steep, but if it's the price I have to pay to get a very fast connection where I'm located, in case I have to work while I'm there next year, I'll pay.
Diamond Resorts also told me that they're aware of the slow and unreliable wi-fi connection and they're working with their provider to solve the problem.