You can use satellite backhaul for a 5G tower. And I'm sure there are many towers with satellite backhaul.

But, once you start having multiple towers near by, you are going to link those up terrestrially (wireless or not) and pretty soon you'll end up with terrestrial backhaul.

Satellite backhaul really only happens in mobile disaster recovery truck-mounted cell sites, and the fairly rare occasions where a rural site can't use terrestrial wireless backhaul.