[denton-scratch]

So "immune to jammers" seems to be hyperbole; perhaps "more resistant to jammers" wuld be a more accurate phrasing.

[yencabulator]

It's really a question of distance, which is not mentioned in the article. Russian style is to park jammer vehicles pretty much evenly spread out on a line behind their defensive boundary.

I'll easily believe "immune to Russian GPS jammers as typically deployed when used X kilometers behind active battles".