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In a battle against a Necromancer on a large map, it's better for Orcs to focus on increasing magic resistance (reflection, magic defense, and barbarian luck) rather than using the "Darkness Shield" spell (it doesn't work as well as the "Chaos Shield" spell) + a set of magic defense artifacts + goblin shamans. This is a great strategy for a battle with a focus on domination.
The video is very interesting. In this case, you should focus on dominating not the Centaurs, but the strongest unit - the Executioners. And attack the second strongest unit, the Cyclops, with them. Apply Berserk to the rest, and you'll be successful :)
P.S. The Necromancer is not leveled up correctly, and I would choose different troops.
Мертвые не кусаются :)