Do you have to include "effect_template" in a Template Light?

As I understand it from the docs, effect_template, effect_list_template and set_effect are “inclusive”, which means you have to include none or all three in a Light Template.

But the example at the top of the page doesn’t include “effect_template”, does it?

So does the example not actually work, or (more likely) have I misunderstood?

Thank you