Current banner message on their website. Sounds like they are "open" but perhaps that is mostly for responders and employees? Would have to be on the ground to know.

IMPORTANT NOTICE: The safety and wellbeing of our guests and colleagues is always a top priority. In response to the wildfire situation that originated in Lahaina, Maui, Hyatt Regency Maui has implemented emergency preparedness procedures in an effort to ensure the safety and security of our guests and colleagues. At this time, we can confirm the hotel is closed to arrivals and not accepting guests through 09/05/2023. Any deposits and prepayments for cancelled stays on these dates, including prepaid rates, will be refunded. Thank you for your understanding. If you have questions, please contact us.

Our thoughts are with members of the Hyatt Regency Maui family and Maui community. Our team is actively working to assess the level of impact. Any additional questions should be directed to local authorities.

Please Note: The Grotto Bar and Swim through Cave are temporarily closed till further notice. The rest of the pool area and F&B Outlets remain open and operating.