Black Widow 3* and Polaris (and a few others I didn't write down over the past few days) do not trigger the "Play a woman for Women's history month" vault. Black Widow 2* does. Storm does.
I've verified this by waiting until a new day, triggering Deadpool points by playing him in a match, then playing the others and they don't trigger.
Spoke with the team on the matter. The list of characters in place is as intended and smaller than including all characters that identify as females to keep the size down.
Then you should post the list somewhere so we don't have to play guessing games.