I think, (and as a non-Ham, I expect to be corrected on this), putting to one side the numbers stuff is meant to be "modem-like" tone encoded signals and so implicitly sort of digital, to the radio amplification its just analogue waves. Amplifying for transmission happens as close to your antenna as possible. You're pumping out radio waves. Not amplifying "bits", you're amplifying waves. Or phase encoded, whatever, The last stage amp is not able to discriminate what's to be amplified, what comes in is what goes out into the masts.

This 40s/50s/60s/70s long distance radio stuff, is pretty much dumb tech. It's not just Russian transmitters, a lot of the old VHF TV was capable of being subverted by brute force injection, and FM radio. All you have to do is assert a stronger time signal and it's going to cohere to it.

There are awesome photos on the Web of these transmitters, huge valves, mercury rectifiers, scary giant coils, oil cooled stuff, it's RF but you treat it like power engineering, because energy is energy: it's "hot".

If you were building one now, you'd send encrypted signal digitally into the gear and avoid as many of the risks as possible. Probably have to be right up close inside the building to phreak the last stage amplifier.

Some ham or ex forces RF person will probably say I got this wrong btw. I'd believe them.