Does the Orbi have ethernet backhaul?

The use case for me is that I have a house using Orbi, a small detached office, and a Carriage house. All are passive solar built and with a mesh wire layer holding the outside insulation on meaning they all act like Faraday cages and wireless signals do not go through the walls well. Orbi is FANTASTIC for my house. I don't have ethernet run throughout the house so the wireless backhaul is great I used to have to have multiple SSIDs around the house which is a real pain.

Unfortunately, Orbi is almost worthless for the other buildings as they can't take advantage of the wireless backhaul. So I use Orbi in my house, with ethernet over powerline out to the other buildings and separate APs with different SSIDs out there. 

The IDEAL solution would be all Orbi with all the same SSIDs. So, the 2 internal satellites would use wireless backhauls while the other buildings would have an Orbi with a wired backhaul. This way there'd be no switching no matter where on the property I am. 

I understand that my use case is very rare, and I'm sticking with Orbi for the house even if they never get a wired backhaul. But, the minute they do get the wired backhaul I'm getting two more satellites and wiring them up.