That's the entire goal, normal appearance so the autism is invisible and quiet rather than any better quality of life for the person with autism unless being ignored is better (it isn't).
Autism is defined by outward behavour. Someone who doesn't have the behavour is by definition not "autistic". It is not a description attempting to capture an actual physiological condition, it is a collection of observations aggregated into a "diagnosis".
Conditioning, in the sense of pavlov, may be used with various intentions. In a trance-state, capture the feeling of something and "anchor" it to a word, or feeling of touch, or something similar. Anchoring (rather than "conditioning") happens spontanously. The emotional reactions to brand names, people, voices, words, environments are all anchored.
Anchors fade, or their triggered responses might cancel each other. When you hear the voice of someone you love, it triggers feelings. When you break up, the feelings change. The idea of NLP in this case, is for example to capture the feeling one wants to have, like "neutral friend", and then anchor it to the voice or face of the person. Ofcourse, it is not trivial or easy. Trance/hypnosis is used to induce states, they are then anchored. For example, imagine hearing the voice as it fades away and disappears. Or, imagin seeing the face slowly fade to gray and shrink in size. The idea is that, the feelings are proportional to the strength of the triggers.
Or something like that.
Being aware how feelings are anchored can help. Think of how certain clothes remind you experiences, how letters remind you of people that remind you of whole episodes. How would affect you if you burned the letters? Or framed the pictures? How music from a certain period can make you sense smells, feelings, etc. The idea is to manipulate these things while in trance.
Many the ideas come from the therapist http://en.wikipedia.org/wiki/Milton_H._Erickson