And since we are humans, it helps to retrain our emotions: "Relinquish the emotion which rests upon a mistaken belief, and seek to feel fully that emotion which fits the facts."

I'd rather call this "self-help" than "meta-ethics." Why self-help? Because...

But it's a standard LW perspective to assert that there is a territory, and some maps of (parts of) it are right and others are wrong.

...even if my emotions are "wrong," why should I care? In this case, the answer can only be that it will help me derive more satisfaction out of life if I get it "right", which seems to fall squarely under the purview of self-help.

Of course we can draw the lines between meta-ethics and self-help in various ways, but there is so much baggage in the label "ethics" that I'd prefer to get away from it as soon as possible.