Salamun Alaikum.
We have no singular for 'Nisa'. It is plural (women).
I suggested 'indicates'. This is admittedly by no means a confirmation. But in the absence of a definitive, it is best implication on my part from a Quranic analytical perspective.
One woman - imra-atun - 4:12, 27:23
Two women - imra-atayni 28:23
Therefore, I made use of 4:11 as a guiding verse.
The feminine dual in 4:11 is represented as 'unthayayni' and not as nisa x2, but when it spoke of more than two females, it referred to it as 'nisa'.
'nisa fawqa ith'natayni' (women more than two) or 2 + females = nisa (women).
I hope this helps, God willing,
Joseph.