I mean you knew the risks when you downloaded the trainer, NONE OF THESE are ban proof especially when the game has some form of anti-cheat like this one. You can't really blame the devs because you downloaded cheats they made and got banned for it.
Yes that seems to be the case, I've used the trainer on solo races only for almost everything for months and nothing happened, yesterday I used the credits cheat because I hated the annoying online features anyway and had nothing to lose.
Today I got the ban which includes all the online features you cant even auction cars or publish nor buy liveries.
For me it was worth it because this game has so much to offer in single player mode and tons of cars to buy and drive.. it would've take me ages of grind and buy them all and I don't have that much time I'm afraid.