Turns out it’s just something to do with charging. The V2L thing is like a mystery. Trying to find out information on it is hard. While looking I did see a picture with the ioniq 5 that has a standard 3 pin socket, and I believe it was under the front seat which seemed daft.
But I don’t know if the 3008 has a socket or needs an adapter. You’d think the brochure would mention this or that Peugeot would advertise and sell the adapter if it’s need.