It's an incomplete list - it doesn't show any of the flt lt - sqn ldr promotions. And whilst they are reduced in comparison to previous years, there have been promotions to sqn ldr.
This may have something to do with a change to how the flt lt promotions are handled. Rather than having a bi-annual list, individuals are notified that they have been provisionally selected for promotion, but they will go into a specific appointment at some point in the next 12 months rather than being promoted off a list and then the desk having to scrabble round to find a post to put them in to. Just a theory, might be wrong, could just the website administrators have made a mistake.