Hm? The ISP gives one IP address to a router in a house, that router uses NAT to let all the computers inside that house use the Internet through the one single shared public IP address. That's NAT, isn't it?
I mean, I understand that this feels normal today, that 10-20-50 devices need internet and that the way to manage that is to nat the connections, but your ISP isn't doing nat, it is you.