@mangeurdenuage @grillchen
apparently someone tested the cables in my original picture (deepl translation)

Charging devices works great. Important to know: If a laptop is to be charged via USB-C, the plug must be plugged into the laptop and not between the power supply unit and the cable. This is because the power supply unit must communicate with the cable to determine up to which power the cable is suitable. If the blocker is plugged into the laptop and the cable is plugged directly into the power supply unit, then up to 100 watts will flow (see image). However, if the plug is plugged into the power supply unit and only then is the cable connected, the output is only approx. 15 watts.