Yes it does and you didn't answer my question. Do you think Sakura harming Kaguya with ninjutsu with a giant truth seeking ball which should negate it makes sense? If you don't think that is PIS then you are clearly not that bright.
And why do you think acid can kill them when it has failed before. Remember Mei vs Sasuke?
Edited my post. But will reply regardless. It doesn't. Many characters are considered smart or stupid without outright being called smart or stupid.
It would be pis if she showed something other than stupidity. I.e. Naruto falling for Petra despite just reminding himself of its effects. Kaguya needed Zetsu to tell her what to do, and when Zetsu gets fooled or removed both end up in a rut. She barely speaks or acts for herself and thinking for herself is clearly too hard for her. She's a dumbass.
Mei's acid=/= different dimension acid. Especially since one's a vapor while the other is a pure liquid.