If you have bonded metal water supply pipes, I would see LESS of a
danger than if you had the same pump setup with plastic lines.
I can't see reducing the call for bonding a pump connected to plastic.
Refering back to the original question from Aaron:
I have seen contractors run the 8awg bonding jumper to a ground rod at the exterior in the presence of PEX.
Metal pump housing should be bonded to the rest of the house system, right or wrong?