What does it mean to book a hotel online with a credit card guarantee and automatically unfreeze it after leaving the hotel?

Hello, the hotel needs your credit card guarantee when booking due to the shortage of rooms, and the room rate will be frozen. After you check in, it will thaw, and the room rate will still be paid by the front desk. You can pay by other credit cards.

The credit card you guarantee can be used, and only the amount guaranteed in it is frozen.