Leisesturm

Maybe. I am trying hard to think of the production e-bike that has regen as an OEM feature. It is certainly 'possible' that a set of Tektro e-brake levers might be attached to a system with regen, but it is far more likely and typical that the electrical line from the brakes to the controller senses braking effort for the reason given earlier: motor cutoff, because having the motor remaining powered while braking is wasteful, if not possibly dangerous. The momentary ducking of motor energy for smooth shifting is usually triggered by electric lines coming directly from the shift lever(s) or the shift cable(s).