Artemis' memory wasn't completly wiped - I think it was Foaly who mentioned that if that were to happen, Arty would loose two years of emotional growth. It was said that all that was removed was the events that had to do with the People. His mind would develope memories to fit in the blank spaces, in time, and so Artemis, Butler, and Julia would still be the same people. Right through, Artemis was still a criminal mastermind - if he didn't have that streak still in him, he would not have thought of the contact lenses, nor of the disc he gave to Mulch Diggims. So in that context, the loss of memory didn't affect him much at all. But, as was mentioned in the book, a full wipe of what has happened in a certain amount of time would lead to a completely different person.
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