I was able to get in touch with the hotel via Patk Hyatt customer care; interesting reply, we’ll see if they stay on track with the opening date:

Please be advised the opening date has been pushed online to 1 April 2025 as a buffer

Your reservation is currently confirmed for the 27th March 2025

Should there be any further delays, we will reach out to all affected guests and will also assist in the relocation process to a property of the same standard as Park Hyatt Johannesburg

Mitch Gemmell, General Manager of the property, is copied in should you have any further queries or concerns