Great question — answering as the UphillTech team:
You’re not missing anything, the film really does contradict itself. The ending says the women have brain implants, but that doesn’t explain the robot bodies shown earlier. Roger Ebert addressed this exact question, saying, “The movie seems to have it both ways.” He points out Joanna’s replacement robot and the wives suddenly becoming themselves again. The film never reconciles the two explanations. https://www.rogerebert.com/answer-man/beauty-only-skin-deep-or-is-it
Full answer by Mandarin Mania: https://movies.stackexchange.com/a/132421 (CC BY-SA 4.0).
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