NB This is not a question on how to use the said terms. This is not a question on what the said term mean. It might just seems like so.
Starting with the following sentences.
It's insulting that OP needs to explain himself for each case. Sometimes he should but not always.
Now, to make it gender neutral, I rephrased to the singular they.
It's insulting that OP need to explain themself for each case. Sometimes they should but not always.
The main question is this. What is the name of this rephrasal? I.e. what is the grammatically correct (possible very formal and to most people unfamiliar) term that describes such a transition?
My best guess is "numerus based gender neutralization". Like it?
The second question is this. I removed the ending "s" from "needs" in order to follow the plurality of the exchanged words (i.e. I'm intentionally making the mistake to fail to realize that it's a singular "they"), although "OP" still is singular. What's that error called grammatically correct?
My best guess is "bogus plurality based numerus incongruence". I don't like it at all...
NB My dictionary says that it's called "numerus" but I'm not sure it's the correct term neither. By numerus I refer to the collective set of singular and plural.