Not defending "Survival" (not seen it, sounds shit) but severing the head does not kill the zombie.
In "Day" there is a still functioning severed head in the lab (under the sheet) and in the mines a zombie gets a spade through it's mouth, and the severed top of the head (from the nose up) is still shown to be alive.
Poles is another matter, I just suppose they were not in that deep.
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