I was unwilling to deactivate my ad blocker for that link, so I have been unable to put my finger in that wound.
Maybe it is "listed" in bitcoin but I would like to see the small print. We have established that the Dubai guys want USD not bitcoin and having received their bitcoin they immediately convert to USD, being shrewd businessmen. So why would they run the enormous risk in pricing and listing in bitcoin? If BTC falls from $20K at time of the print run the apartments get snapped up and the entrepeneurs make huge losses. If they get priced at $7K and BTC rises to $10k no sane person would touch them.
I understand that 50 of 1300 apartments were listed in bitcoin the rest presumably listed in dollars. Assuming these are comparable apartments the list prices will need to be consistent, this would even be true for listings in different fiat. With the BTC/$ exchange rate gyrating violently on an hourly basis the owners must have some mechanism for adjusting the list price. My guess is that the small print indicates that the list price is in fact a guide price and the true price is USD and the BTC price will be adjusted at the exchange rate at time of sale.