It keeps getting repeated precisely because it isn't gaslighting. And yet we still see people claiming that NAT is security.

The only reason those networks aren't exposed to the whole Internet on v4 is because they're using RFC1918, not because of NAT -- but that still leaves them exposed to some outside networks, so routers come with firewalls, which act as an actual security boundary.

And they won't be exposed on v6, because those exact same firewalls work their magic on v6 too.

NAT doesn't provide and isn't needed for security. Its main security contribution is to confuse people about how secure their network is.