Have you seen people regularly use the word "mansplaining" to describe the actions of any women (while knowing that the person they were referring to was a woman)?

I don't believe that I have seen that.

The meaning of words is not their etymology, but it is how they are used and understood.

And, ime, people seem to use the word "mansplaining" to refer to actions of (people that they believe to be) men (or corporations?).

Perhaps your experience differs on this topic though?