Makes "Itchy and scratchy the movie" not real

At the end of itchy and scratchy the movie it shows bart grow up to be a Justice of the Supreme Court making him NOT a failure but according to the simpson gene he would in fact be a failure

How is this Non-canon?

I don't understand why this is referred to as non-canon, it mainly talks about Lisa's confusion of being a real member of the family, but other than that things seem to follow continuity quite clearly. I don't see how this can't be canon. Any one who has evidence can comment on this.

-- User:RightFielder

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