updates once a month wasnt something you were supposed to take to the letter, in the literal sense of it, its updates whenever they need to make an update to make the next event which is about once every month
the "more content per update" that was just to help you swallow the pill, in reality there has been the same amount of content per update or less.
the only "big update" they said they were working on is adding sets to their KB which is something no one really cares about, dont get me wrong, it might be nice for the people who use their KB, but set stats are already available to everyone on tw-calc
but thinking about it, considering the number of sets that exist in the game, creating a page for every single one of them takes time (if you do it manually 1 by 1), that must be why this update is getting delayed, in any case its not something any player considers a priority for the limited resources to be allocated to.
to put things simply there is nothing wrong and things will keep going on like this, players just have to understand that the reality of the game does not match their expectations and that wont change, and complaining about it is a waste of time, you either accept to play like this or you leave