Hmm, I took that differently – that what an Eorzean would call a Miqo'te is usually called "Hhetsarro" but there are some smaller clans of cat-people (perhaps like the family from the Perch of the Apex role quest) who don't appreciate being called Hhetsarro.
On a closer read, it does seem to say that there can be people of different races within a clan, but that seems strange terminology-wise, and certainly Wuk Lamat and Koana still seem to identify as Xbr'aal and Hhetsarro rather than adopted into a Mamool Ja clan.
We might just have to wait for the custom deliveries and see if Wawlika and Nitowikwe say more about what they regard themselves to be.
