When you land on the Element page from TravelZoo, if you click on Dates Flexible? Browse Calendar instead of Book Now, you will see all dates currently available for check-in @ $89 (like the weekly StarPicks calendar). NYC has single dates only in April except for April 15-17.

I booked 5 nights Element NYC @ $89, August 30 - September 4 which is no longer showing as available.