This is a relatively old bug, but I couldn't find any mention of it in patch notes or recent bug reports, although I didn't dig all the way back to expansion release date. So, here it is:
Boneyard ghost attacks do not avoid electric resistance. I used the tesla armor and boots with galvanic padding for 100% resistance to safely loot the whole place, while repairing the armor once in a while. You could say it's a feature and call it a day though.
When I tried to reproduce it on the exact same save games that allowed me to reproduce it before, I couldn't, because the ghosts refused to show up.
Here are 3 saves, all made on patch 1.1.0.12, two of them are at the boneyard, one of which is a permanent autosave and another was made after clearing the game to reproduce the bug:
https://drive.google.com/file/d/1BkdaJpEx4OHv-U4bmhCqqRmD1nYjODCS/view?usp=sharingOn the autosave tesla suit is not equipped, but is inside the inventory. And you probably won't see the ghosts on these saves unless you load them in an older expedition version.