Someone attacking a nuclear facility can get a receiver within range
Not only that. Due to the extremely low bandwidth in these channels and being one way, sendimg documents would be extremely slow.
Likely on the order of hours or days for a text only word document.
You cannot do any re-transmissions for broken bits.
And the range is VERY low for normal PC's that have had to pass EMC tests. For an all glass gamer RGB PC the things will be different.
It’s true that there are many better ways to do it. If a nation state only had this option, I think they could pull it off though.
Wouldn't there the small matter of a few meters of concrete attenuating any signals coming from a nuclear facility?