Yes, that's right. Database X for other purposes and database Y for SSAS.

So I can use WFCL for clustering SSAS instance, and the same WFCL for creating AG for Database enginge, but I can't link them together (however I can use AG...

What about SSAS database? Why first document says it is not possible to use availability groups?

I want to cluster SSAS. I want to use availability groups for SSAS database itself and usual WFCL for clustering SSAS role. The first paper I mentioned says that I...