> Like the article says, satellite messages can be traced while radio is broadcast to everyone

I don't buy it.

Satellite downlinks are broadcast to everyone under a potentially massive footprint. Take a look at the footprint for QO-100 which you could use with very inexpensive equipment that looks pretty much like a normal satellite TV dish.

https://jeremyclark.ca/wp/telecom/sdr-for-qo-100-satellite-r...