Let's put it this way: if you don't take steps to correct this goof by Bulls, when those wires chafe and short out, you can kiss your ebike drive away.
If this bike is still under a factory warranty, I'd look into exploring some kind of settlement with Bulls with an eye towards complete frame replacement. At a minimum, they've guaranteed you an annual replacement of your headset lower bearing as it collects rain water after each weather event. And at every full lock movement of your handlebars, that wire run is rubbing against that headstock opening.
Your initial picture showing the running rust was bad enough for a newish-bike. Your latest picture just floored me as I'd expect a higher tier bike manufacturer to not make this kind of design error. There is an ongoing thread over on MTBR about a Trek mountain bike owner unhappy over his dropper post cable lug was welded in at the factory upside down. This meant his cable could not be secured onto the cable lug as designed. Certainly not as big an error as this condition on your Bulls. I believe after complaining loud enough, Trek replaced his frame, outright.
Again, look again at how Haibike runs their wire runs and compare that with the haphazard way your Bulls is run. Haibike makes an actual plastic insert that is fitted into the frame, held in place by a machine screw, for their wire runs in and out of the frame.
You really need to talk with your ebike dealer. This is totally unsat.