The aircraft landed safely after the radalt cb was pulled, pilots should be able to fly an ILS raw data no AP and no FD. All true.
Modern aircraft are highly complex and the systems are hugely interrelated, the failure of one system is rarely a single event with no other consequence than the single failure. In this case the AP FD and EGPWS all failed. The MEL will tell you whether it is legally acceptable to fly in this situation and what maintenance and operational actions are required for the flight to be undertaken. In flight events are dealt with by the QRH.
The problem here is the astounding actions of the check pilot who deliberately degraded the aircraft's systems during a critical phase of flight. Apart from the manufacturers instructions about not pulling a CB except as mandated as part of a QRH drill - it is common sense that you do not do this.
The mere fact that this Check Pilot thought he knew more than the manufacturers and was so smart and able that he could deal with any situation that arose as a result of his actions FROM THE JUMP SEAT beggars belief. We are all aware that accidents are the result of all the holes in the swiss cheese lining up - why on earth would any professional aviator deliberately reduce flight safety by lining some holes up intentionally. There is a place for these actions - the simulator, as any half decent pilot, let alone check pilot knows.
This man should be grounded by the company pending a full investigation. Failing that the regulators should pull his licence until the full facts are known.