The most recent handbook i see online for owners is the 2010 handbook and on page 35-36 it states "Same place, different time". Meaning you can reserve 12 to 10 months prior to go to your home resort on a different week than scheduled.
As pointed out already, you're looking at a deeded fixed week 23. If that fixed week 23 is not what you want for use and occupancy, don't buy it (IMnsHO).
It seems counter-intuitive to buy a deeded fixed week you don't want or intend to use, just to
attempt (with no guarantee of availability) to use it to
maybe access a better, higher demand week at the same place --- and also have to initiate that effort (with uncertain results) 12-10 months in advance to boot.
It would seem to make a lot more sense to hold out for a fixed week that you
want to use, with its' guaranteed access. Why buy into the uncertainty of attempting to use a lesser week to (only maybe) access a better week of higher demand (and surely less availability) at the same property? Owners of those higher demand July / August fixed weeks likely own them to use them or rent them out or deposit them for exchange (via RCI). It would be little more than a "hope" that any of those higher demand weeks would ever actually be made available to you
at all.
Just my personal opinion. I admittedly know nothing about that particular resort, but the reality of the reservation obstacles mentioned above still apply.