I know nothing about the Aldhu crankset. However, I own two bikes with the Rotor cranks and Type-S P2Max. Going on 4yrs and aside from battery changes, no problems. They just work! No calibration.
As for the Rotor cranks no longer being made, I would not worry. You are buying from P2Max. If you have a problem, I am sure they will take care of you.