Uh no. That's silly.
"(The court ain't buying "group B")"
Wrong. The court is not deciding group B.
"Of course it does:"
Nope. It only declared that group A, which nobody disagrees about, were clearly natural born citizens. It did not restrict the definition to that group.
"(except this ain't England, and we ain't "subjects")"
Which is why they changed "subject" to "citizen". duh.
But they otherwise kept the phrase because it carried the meaning they intended. As Wong Kim Ark explains in detail.
every child born in England of alien parents was a natural-born subject
Which means literally that they wished the US to be forever governed by enemy agents.
Those evil bastards!