I'm not comfortable sharing the number, but there's a good deal of inventory offline in the Value and Moderate categories. The cost to bring these blocks back up is not insignificant, in addition to staffing up to accommodate them.
Also, re: room categories "running out" for later this year...
Inventory management has been tighter since the COVID reopenings, and only a certain amount of rooms and room categories are in the hopper and available at any given time. I've never quite figured out the methodology of blocks, holds, and availability cadence, but I'm sure the big brains can make sense of it.