1) There's an episode of Sailor Moon S where the Outer Senshi discuss their spheres with Tuxedo Kamen. Pluto is shown as a gas giant with rings and multiple large moons. Obviously, it isn't like that now.
So, yes, Setsuna likely knows Pluto's been downgraded. She might not know that the IAU has followed suit.
2) Beats me...
--
Rob Kelk
"Governments have no right to question the loyalty of those who oppose
them. Adversaries remain citizens of the same state, common subjects of
the same sovereign, servants of the same law."
- Michael Ignatieff, addressing Stanford University in 2012
So, yes, Setsuna likely knows Pluto's been downgraded. She might not know that the IAU has followed suit.
2) Beats me...
--
Rob Kelk
"Governments have no right to question the loyalty of those who oppose
them. Adversaries remain citizens of the same state, common subjects of
the same sovereign, servants of the same law."
- Michael Ignatieff, addressing Stanford University in 2012