Edit i read the informations given in the briefing before the task, and they say that there might be offensive content displayed. They say to tell them if it happens, but well I did and got no answer so weeeell, not so inclined to believe they care about it
This varies by country, but in many countries it doesn't matter if it is a drawing, AI, or a real image -- they are treated equally for the purposes of CSAM.
So screw the company, report it yourself and make sure to cite the company and their lack of a response. There’s a Grand Canyon sized chasm between “offensive content” and csam.