Trainers are updated based on live demand from the community. See this post here for how it works: Vampyr for Windows suggestion - #2 by Ravenfyre.
Bear in mind, three new Grand Theft Auto Games were released recently, almost immediately pushing everything else at WeMod down the development queue, because more people at WeMod wanted those three trainers done than this one, given that Grand Theft Auto is one of the most popular franchises of all time. 
Trainers will be updated in due time if it is in the queue. Please be patient, there’s little WeMod can do if the community democratically decide something else should be made or updated before the game you play, except to respect those decisions.
I regularly use my free time to post free games in the community, partially so those waiting for updates have something else to do while waiting: Deals + Giveaways - WeMod Community.