They speak of Marlin and hence using esteps = 400. Although this needs to be calibrated too as it is rarely such an even number.
Klipper uses rotational_distance instead of esteps though you need to define full_steps_per_rotation or omit it for a 1.8° stepper driver.
You want to read here:
https://www.klipper3d.org/Rotation_Distance.html
A short research showed that you should try to calibrate your feeder with a base rotational_distance: 8.