ZK translation: be reborn an isometric drone

[Mike Jing]

P147.7-14   The guide had told us about brains preserved in insulated
vessels. Now she added that heads, entire heads with brains intact, were
sometimes removed from the bodies and stored separately. One day in decades
to come the head will be grafted to a healthy nanobody.
       And would all the revivified lives be identical, trimmed tight by
the process itself? Die a human, be reborn an isometric drone.

In what sense is the word "drone" used here?
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