'Double Economy' mod doesn't do anything

I subscribed to a mod called double economy. It’s supposed to cut villager cost in half but it doesn’t. Doesn’t seem to do anything at all.

I’ve gone into the mod manager made sure it’s ‘on’ and priority one.

But then I got start a skirmish game and nothing happens.

This is the first time I’ve loaded a mod am I missing something basic here?

All comments welcome.