I am a bit worried about this 1.03 patch note:
>>>Player Profile Validation – The player profile is now validated and corrupt profiles (caused by manual editing or tweak tools) rejected.<<<
I hope they don't detect trainer injections and delete your save file.
User "Sealbreaker" here posted in the "Horizon Zero Dawn Trainer" Thread an interesting thing:
"I asked, if it is "allowed" in some kind.
They stated, that everyone is free to use 3rd party-Programms on theyr own risk and yes, it could help if you use the Trainer to reproduce crashes."
So I think they won't delete any savefiles.
But I gonna test it and reply as soon as possible! 🙂