It's been known that Russia does GPS interference near their Western border and the Baltic down to Ukraine for several years now. It's something airline pilots prepare for now, and expect.
Not sure why this is being couched as novel or surprising.
You could actually try reading the paper first before posting comments like this.
The novel aspect is that it is being conducted by a satellite, rather than a ground station. Which is an escalation in sophistication which makes counter-jamming much more difficult and also gives global reach to the jammer.