Congress implemented the restrictions. If they get enough heat, they can request that the President create an executive order that delays the actions against DJI until a security review has been performed.
The end result is that the official pipeline for sales to the US has been turned off, and there is no real warranty support. Yes, you can buy grey-market drones, but you have to deal with the vagaries of the US Customs Service and no after-sales...
I totally get the idea behind doing an email campaign — it feels like an easy way for a lot of people to speak up at once. The problem is, congressional staffers can spot those mass emails instantly. They know when it’s part of an organized push...
I don't think DJI is even going to try to bring this one to the US in the current environment. They could have brought the Mini 5 in, but chose not to.
Hence, we cannot conclude that it was your modified antennas that doubled the range? Maybe just maybe it was actually the clear LOS that made the difference.