No. Trainers do not touch the game or any save files. They just inject values into your PC’s RAM.
This game has a few in-game issues. Including crashes, missing audio, missing dialogue and save corruption. These issues are occurring for people who do not use cheats like WeMod, you can find these complaints from non-WeModders using Google.
This is nothing new for Ubisoft. It’s almost to be expected. Best we can all do is wait for hotfixes to be released - because there will be quite a few of them, I’d imagine, all of which will break the compatibility of this trainer.