def METHOD_NAME(self, user, problem_instance):
    prev = super(
        SimilarityDisqualificationMixin, self
    ).METHOD_NAME(user, problem_instance)
    return (
        prev
        or SubmissionsSimilarityEntry.objects.filter(
            submission__problem_instance=problem_instance.id,
            submission__user=user.id,
        )
        .filter(guilty=True)
        .exists()
    )