I suspect that they may have not received their liquor license as yet, although a photo on TripAdvisor shows a wine setup in a guest's room [although the guest could have brought the wine with them]. A peek at the hotel's dining site at this link makes a specific mention of "non-alcoholic Gin & Tonic" at the rooftop bar... so who knows. Maybe it is dry.

Best to get in touch with the hotel directly to confirm if they're fully dry or in the process of getting their license.

khabah