The dhingra and marrow mcq explanations vestibular neurectomy

the dhingra and marrow mcq explanations vestibular neurectomy is given as a conservative procedure but here in the mcq 21 it is considered as a destructive procedure
What should we consider ?

Destructive means abolishing the vestibular afferent signalling.

Where it is mentioned as conservative, they must be referring as conservation of hearing specifically and that would be mentioned in the question as procedures that conserve hearing or procedures to be done in good cochlear reserve