If meta discussion is discussion about discussion then that means there is still a discussion going on and there is still a subject. Maybe if I work on identifying the subject in each quote it will help to know if a quote counts as meta discussion.
Quote #1:
Im talking about a previous statement that I meant to refer to. Hmm me talking about something from the discussion sounds like meta discussion.
Quote #2:
Im talking about a correction in my grammar/spelling. The mistake made is part of the discussion where I think it already is a meta discussion. Here(the bold is the spelling/grammar mistake):
Quote #3:
The subject is whether something from the grammar discussion counts as meta discussion or not. Something from the discussion is being discussed. That literally sounds like meta discussion.
Quote #4
I’m talking about how I don’t know if more parts of the discussion are actually meta discussion. That again sounds like discussing about the discussion.
Im gonna try what I did in this reply for earlier parts of the discussion.