That is definitely not how China would enforce it.
You need a Starlink terminal in order to communicate with the satellite. China will most likely just block the sales of Starlink terminals in the country if they want to enforce a ban.
I find it hard to believe that they are completely re-designing the avionics/flight computers because of this gamma ray incident. There must be another reason.
If it's seriously the main concern, wouldn't it be much easier to just encase the computer in several inches of lead shielding?
Imagine you are SpaceX. You are going to be launching a Starship. Given how booked your launch manifest is, would you rather launch a cubesat or a full-sized payload? Which would earn you more money?
Starship still needs to fire rockets in order to land. I would say it's a crazier idea than the ones you have mentioned. The previous solutions you have listed were used precisely because they were less crazy ideas.
I mean, the whole statement is not correct. Sure JPL manufactured some things but it also acts just like NASA, managing the Mars projects. Most of the spacecraft I would say were manufactured in partnership with other industry aerospace companies.
Every manufacturer needs a good revenue source. Unless you are a manufacturer that is making mass market cars like Honda and Toyota, you need to create cars that people will buy if you want to continue making your niche sports cars.
when the Cayenne was introduced, Porsche was ridiculed for making such a big, ugly car compared to their 911s but look how popular they are now.
Manufacturers don't make cars just for the hell of it. They make cars that the market demands, even if it's to the disgust of car enthusiasts.
From another source:
The X-59 has been designed to achieve a PLdB of 75, similar to what might be heard when standing next to a heavily trafficked road.