Poor choice of wording on my part. I meant to say that comparing moralities is one of the things that meta-ethics covers; that if you are engaged in comparing moralities, you are doing meta-ethics. Is this wrong?

I think it is. Comparing moralities is part of morality. ...

Hmmm. I think you are right. At the risk of appearing really ridiculous, I now have to admit that I used poor wording in my confession above that I had used poor wording. What I really should have said is that if you are discussing the criteria that AIs might use in comparing moralities, as I did in the OP, then you are doing meta-ethics.

Is this wrong too?