Correct, bcde. The preferred shareholders are promoting a "myth" that the preferreds will get better treatment from the courts/administration.
This is probably due to a biased optimism on the part of preferreds.
"The courts" declare contracts valid/void/enforceable/not enforcable. The US Treasury has other tasks but does not "declare its own contracts" as valid or void. It is called "seperation of powers" between the executive (president), legislative (congress) and Judicial (the courts) branches of government.
Our consititution is based on this sepearation of powers so that a dictator can not just take property and keep it. The courts will decide if this contract is enforcable, not the UST.