Another question for those who are against the death penalty

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Hypothetical for who against society punishing out of revenge.

A new micro brain surgery has been developed. The affects of which are those who have committed a crime and then had the surgery no longer have the impulse to committ crime with 100% certainty. There are no side affects from said surgery other than not committing crimes.

A man is convicted of rapping 10 children. He undergoes the surgery and now with 100% certainty is no longer a danger to committ this or any other crime again. Should this man be imprisioned for any length of time?

Electing to have all members of society to undergo preemptive surgery is not an option.