(I think you should’ve included my quote that you responded to, otherwise I couldn’t see that this was meta.)
You got the subject right. And I would say that is meta because it discusses the nature of the discussion, the category of discussion. Was the discussion meta or not? That’s a meta discussion question.
I think this reason is wrong or is problematic wording:
Because that could mean that the discussion was about X and Y, and now we started discussion Y. Y was from the discussion, but it isn’t necessarily meta discussion. If you changed “from” to “about” then that would make sense as a reason for being meta.