But that’s just the first TEST, not the real proven weapon. There will be many tests before its is perfected.
The point you are missing here is ALL manned space flight will be ended. And as you said we will be trapped on a rock with Russia, relegated back to LORAN navigation. More reason to completely destroy the degenerate country, utterly ... to the point it of nonexistence.
Nukes in space are not a new idea. The USA detonated in a nuke in space over 60 years ago (Starfish Prime). This was since outlawed by the 1967 Outer Space Treaty, to which Russia is a signatory.
They temporarily excite the Van Allen Belts to a higher flux. That secondary effect is what would widely effect satellites in Low Earth Orbit, not direct blast or radiation from the detonation, which would be quite localized in the vastness of near Earth space.
Also, an exceptional light show for the Northern Lights.