It would appear that CX tables are not available for Cloud Services users.
From what I could understand they are hosted in prod in the "wikishared" database. This one itself doesn't seem accessible.
Is it possible to add CX tables (or all this base if possible) to the replicas?
I suppose it would involve getting a security review of the schema to determine what fields can be exposed, and the need to figure out if there is space for the data.
Related: table sizes are exposed at T189088#4241980
There was a great job done by @Bawolff who did a security review already (T103011) and for the cx tables it is not completely clear their status: (cross posting from that ticket)
cx_corpora (Probably concerns that cxc_content could contain private data and wouldn't be revdeletable. Not really sure)
cx_drafts (Could contain private info that's not revdel'able. As well as assumption that drafts are private)
cx_lists (Presumably ok if cxl_public = 1, otherwise should be redacted)
cx_suggestions (Entries on cx_lists. Again fine if the list in question is public)
cx_translations (Seems to map user id to translation_ids. Don't really know what its used for, looks safe)
cx_translators (I really don't know if in progress translations are secret or public)