They Do It With Mirrors

product.has_only_default_variant: false
product.options_with_values.size == 1: 1
product.available == false: true
block.settings.unavailable_variants == 'hide': show
target.option1: New
product.option1:
product.options_with_values: [{"name":"Condition","position":1,"values":["New"]}]
product group: 10
product type: Book
is_new_or_remainder_or_default_title? true
has_only_one_condition_option? true