I felt the repeating made the ending just a tad creepier, because it really drove home the point of how much of a marionette he'd become, that he literally had no will at all to resist whatever he was instructed to do. It's especially poignant because the common convention in movies about brainwashing (The Manchurian Candidate, Star Trek II, etc.) is that the person eventually summons up the will to resist his tormentors. You're half expecting that to happen in this final scene, and when he doesn't, and when he actually acts exactly according to the suggestion with a verbatim repeat of the quote, it's really effective.
In any case, there are a lot of things you can accuse this film of, but being insufficiently ambiguous isn't one of them.
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