Again, I ask: what is NAT doing to make those internal addresses unreachable? What side effect of NAT is making it basically impossible to expose your devices?
In the post I was replying to, the hosts were already unreachable (or... mostly unreachable, not completely unreachable) before NAT was even in the picture.
I think the problem is that everyone else is operating under the assumption that all the computers on the network still to be able to make outgoing connections to the Internet and you're not.
If I want all the computer on my network to have Internet access, I have two options: Each gets a publicly routable IP, which results in all computers being exposed to incoming connections unless I have a firewall, or I get a single IP which gets assigned to my router, use NAT, and all my devices are no longer exposed to incoming connections unless I go out of my way to configure port forwarding on the router.
So when I talk about the "side effect of using NAT", I really mean "side effect of using NAT instead of assigning public IPs to each computer on my network".
In the post I was replying to, the hosts were already unreachable (or... mostly unreachable, not completely unreachable) before NAT was even in the picture.