The only thing your cede document proves is that the state of SC had the authority to cede.
It did so under two laws, one by South Carolina in 1805 granting that permission, and under a federal law of 1794, allowing states to conditionally cede land to the federal government in order to occupy these state lands for purposes of defense.
The fact that South Carolina allowed the government to occupy these emplacements in no way permitted these to be used against the state.
Occupying sovereign state lands to coerce the people of that state is not allowed under the law above mentioned.
With regard to Anderson, he had no orders from the military command because of the armistice. He was not attacked, nor did he have any threat. That is verified by the facts that Confederate guards did not stop his troop movement at the docks, or in the crossing to Ft. Sumter. There was not threat.
He moved without direction or permission, and seized the property by stealth and force.
You’re welcome to believe any of that foolishness but know that it goes beyond cock-eyed and into the realm of sheer lunacy.
The law and history do not comport with your POV.
Shine on you crazy diamond!