Earlier quoted context omitted.
I do know of at least one company who has black-holed the entire DoD ip space and are using it for internal space, which is why I gave a speculation warning... it's really strange regardless.
This will trip up most SOC workflows in funny ways, and I like it. IPs having a global distinction between public/private is a convention, but local routing can widely differ. Same with the "China Cyberattacks" - the guys sitting on top of my outgoing fiber can simulate any IP address they want to me.
192.0.0.0/24, 10/8, 172.16/12, and various other subslices of 192/8 are reserved for local use and are not publicly routable.