Ok, I am an attorney, but I will step in only to explain this. It's not unique to Hyatt, it is common with all timeshares. Let's say that there are 10 units. With 52 weeks, that makes 520 unit-weeks, lets say ranging numerically for reference/inventory purposes from 01/01 (unit one, week one) to 10/52 (unit 10/week 52). So in order to sell "the building" they must account for all 520 units, with no duplicates. So each of the 520 deeds will have a different ID number within the range. (Leave aside the question of biennials for the example, but there could be more than 520 deeds if there were biennials). Each deed provides that singular unit-week SUBJECT TO the CC&Rs which control the HOA. This is right there on the deed. In the case of floating time, it will say something along the lines of "This is a Platinum Interest" or "365,000/987,000,000 points" or something that would alert you there is an underlying scheme you are under.
In the CC&Rs, (which stands for Covenants, Conditions and Restrictions), are the actual rules, which by virtue of purchasing, you are agreeing to abide by. Most commonly this would be in a condo setting, and you have to abide by the condo rules, such as: no pets, no BBQ grills, only certain window decorations at Halloween, whatever. In the timeshare context, this is the entirety of the rules of the "Club" (which operates like a master association) as well as whatever the particular resort is offering: floating season, points, fixed unit, (or in this particular case a certain band of floors), reservation windows, points allocated for the unit-week, etc. Here, the CC&RS currently call for the use of what specific week you purchased, but NOT the unit week, so you ALREADY do not have the deeded week use. (Contrast this to say Key West where their CC&RS DO call for that specific unit/week on the deed to be used.)
It sounds like HRC is asking to be freed from having to provide the fixed week via a change to the CC&RS, in case they decide to sell the company, to make it more attractive. I don't own there so I haven't seen the documents. If they are perhaps going to offer the floating concept later, this may be why they are asking. No comment on that since I haven't looked at it.