Correct. That's what they said.
"It protects their RKBA no matter where in the US they are, even the District of Columbia."
Correct.
No Federal, or mere State law, may infringe on this Right as per the Constitution."
Oops. Where did they say that? They said the District of Columbia's law infringed on an individual right, yes. They said the second amendment applied to the District of Columbia, yes.
But that's about it. I didn't see anything about state laws in there. Point that out for me.
Are there individuals in other States? Then it applies dumbass...