I have no issue with this, it's MUCH better than using the category 'woman' for both born women and trans women because it would be inaccurate.
The cis-prefix is not unlike the word 'bio bike'. Idk if the English language uses it too but in German the bio prefix arose as a response to the increasing number of e-bikes in order to specify a bicycle as human-only powered.
It's a normal linguistic process.