Is GNSS jamming really as bad a problem as the article makes it seem? The article itself reads like guerilla advertising so I'm inclined not to take it at face value.
Near a warzone with consumer hardware? Yes. Military hardware uses different signals, encryption, more advanced receivers, etc etc, but these things are on ITAR lists and not shared with the public. It's a little surprising to me that there's a commercial venture that has been allowed to provide these things to the public at some point.
Because ITAR only applies to US companies, non-US companies can do and sell whatever they want. My favorite example is CRPA antenna, where they can block the jamming signal, so it was on ITAR. Other countries like Turkey and China doesn't care so you can even buy one of them in alibaba. They got all the money while the US company can't compete because they're not allowed to, so after several lobbying efforts, that technology got downgraded from ITAR, very toxic export control, to EAR, your normal export control.
Another example is high frame rate thermal camera, US companies are banned from exporting cameras above 9 fps, while chinese companies freely sells 50 fps cameras