Thank KristenNix,
I follow the onemileatatime instruction and looked up the "standard" rate for 3 people. It is only showing the suite. Doe that mean no loft room with pull out sofa or none of the large loft room is available, that is why they forcing me to book a suite?
Availability could be limited for your dates. To confirm whether Loft rooms are available for your dates, you can call the hotel directly or reach out to a Privé advisor who can double check this for you.