The bonding of the Grounding Electrode Conductor ( GEC) to each end of a metal raceway is required in 250 Part C, 250-64.
It appears the question has the GEC and the Equipment Grounding Conductor (EGC) inter-mixed.
Where a metal raceway encloses an EGC, I do not know where the NEC requires bonding each end of a metal raceway to the EGC. I also do not know where the NEC prohibits that practice.
250 Parts D, E, F, G, in general covers the equipment grounding required for systems less than 1000 volts.