Repairman refused to fix my bike as it’s “dangerous”?

I’m new to Berlin and bought this bike for €100 which I thought was a good deal. I rode it home with no problems, but the next day i realised the back tyre had deflated, so i took it to my local shop. I asked if they could put in a new tube and he took one look at it and said something like “no way am I repairing this bike, it’s dangerous” and pointed to the front fork. At this point I stopped understanding what he was saying as my German isn’t good enough, but it was something to do with the fork not lining up with the front post?

Is this possible? It seems like a normal bike to me, I rode it home and I’m worried it will crash and give me a serious injury. He seemed to suggest something about the weight being distributed unevenly across the front or something…

Thanks guys!