Wow. That's reaching.
How would blowing up the building weaken the Supreme Court?
First of all that is miles beside the point.
It is miles beside the point because you brought of the act of blowing up the the building, which is miles beside the point and a complete strawman with zero relevance to what the GOP congress did. What they did is far closer to and in fact less disruptive than what many protest do, including many led by leftist organizations, such as the BLM.
The point is not how badly the Court would be disrupted, but what the act would be called.
You are the one that just said that disrupting government is inherently an act of "warfare". So, by your own definition, whether and how much it disrupts government determines what it is called.
Illegally blowing up a government building would and should be called either an act of war or an act of terrorism because it would virtually always be done to either kill members of that government (an act of war) or to terrify members of that government to impact their policies (an act of terrorism). Whether it actually disrupts government isn't relevant to whether it is an act of war or terrorism, except by you own unreasonable definition.
Regardless, unless you are going to say that much of what BLM and other leftist protest groups have done is criminal treason, then you cannot rationally say that what Congress did is treason.
What Congress did and Trump is doing is NOT treason, it's worse than a lot of treason.
The problem is that people wrongly think that treason is the worst thing one can do to harm one's nation, and that is false.
What Congress did and most of what Trump has done are worse than many things that would be treason. They have acted to attack the basic principles on which the US government was founded and which have produced 100% of the moral, political progress over the last 2+ centuries. They are not enemies in warfare, but they most definitely enemies of the United States and the interests of the majority of its inhabitants, more dangerous to our constitutional democracy and its founding principles than all foreign enemies combined.
The reality is that most of the worst things that one can do to harm US citizens and undermine the basic principles of the US government are not only not treason, they are legal. That doesn't mean we shouldn't identify such actors as enemies of the US and act in every legal manner to stop them. It just means that its not as easy as prosecuting them for the crime of treason.