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.

Veritasium did a video a few weeks ago about scientists trying to figure out where a space based GPS jamming signal came from. https://www.youtube.com/watch?v=tz23G_UXCGA

I also read the same guerilla advertising for an alternative between the lines. If I understood it correctly from the article, the alternative itself is basically more of the same, but with a stronger signal.

So they basically will launch 300 satellites with an alternative that will face the exact same issues once jamming output signals increase too?

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.