It seems the 2 BR Signature Villa is indeed part of the residences, so this would mean there is dedicated staff in-residence in your villa 24 hours.

We had a 4-bedroom villa once, and it was amazing. 3 staff (ladies) took care of everything. They prepared all meals and drinks in the villa according to our requests, with the exception of the private barbecue, which was handled by a chef from the main kitchen. We hardly left the villa for the main resort, except when going to the beach or spa.