Conservatively...No.
Hello Jim.
I have seen most of the Kata for the one-sword techniques and the Ni-To and in them I did NOT notice any practical and obvious signs that the opponent was wearing Yoroi.
However I do not train in Niten Ichi Ryu so I cannot say for certain.
Pehaps Hyakutake-san knows and will provide a definate answer.
As far as I have seen they do NOT. All the attacks are aimed at areas that are accessible in Kimono such as the throat, and the wrists but beyond that I don't see any emphasis on Yoroi avoiding cuts in the Kata that I know of.
Sorry about the uncertainty of the answer..
Abayo.
Ben Sharples.
智は知恵、仁は思いやり、勇は勇気と説いています。