It's not less accurate to her Dittany, for reasons which are clearly obvious. To her, patriarchy is not as useful a term as kyriarchy because it ignores the other oppressions, e.g racism, that she faces.
You're happy to pick over one sentence in her post, but ignore what she's actually saying. It proves her point, I can see exactly why she choses the term kyriarchy because it's her way of saying this is my reality, these are my issues and you don't get to ignore them in the name of 'purity' or for 'the good of the movement'.
Saying that a woman who is affected by racism and sexism, can only discuss the latter or she's diluting feminism is nonsense, especially when it's put forward by people who do not experience racism themselves. Do you not see the problem with this and with you so casually deeming her viewpoint as "less accurate"? Who exactly is the judge of what's accurate and who gave them that power?
As for "why should I engage her argument, she didn't post it here?", shall we ignore the content of all links posted in this section because they weren't directly written by MN members here?