This map assumes that the only targets are silo’s. But that is not true at all. There are other military and industrial sites. And if they go after the nuclear power plants than the US would be an inhabitable wasteland.
They’d ram one torpedoes of these up the Chesapeake Bay and swamp everything from Newport News to Washington with cobalt-60 contaminated water.
We likely have something similar and haven’t made it public.
Status-6 Oceanic Multipurpose System
The Poseidon (Russian: Посейдон, “Poseidon”, GRAU index 2M39, NATO reporting name Kanyon), previously known by Russian codename Status-6 (Russian: Статус-6), is an autonomous, nuclear-powered unmanned underwater vehicle reportedly in production by Rubin Design Bureau, capable of delivering both conventional and nuclear warheads.
https://en.wikipedia.org/wiki/Status-6_Oceanic_Multipurpose_System